计科：week11 自编选择题

[wujr5]

week11 Experiment 5.5

自编选择题

由于本周没有实验任务，根据老师要求，添加小小的课后练习。很轻松，很简单，也很有趣。

要求

1. 每个人设计三道选择题。
2. 每一道选择题覆盖的知识点不限，但不能太简单，一看就懂的那种就十分不建议。
3. 最好是C++语言中难以理解的知识点，或者容易忽略的重点。
4. 除了问题以外，你还有为你的问题准备答案，以及相关解释。
5. 周五上课随机抽取部分同学的选择题，让大家一起做，然后由作者讲解，其他同学可以质疑并提问。
6. 请使用英文。

模板

0 简介

你的姓名学号 balabala你出题的初衷诸如此类

1 题目

1.1 题目1

balabala题目内容

1.2 题目2

balabala题目内容

1.3 题目3

balabala题目内容

2 答案及解析

2.1 题目1答案及解析

balabala题目答案及解析

2.2 题目2答案及解析

balabala题目答案及解析

2.3 题目3答案及解析

balabala题目答案及解析

提交

提交到如下文件夹。

命名格式

cs_cpp_学号_姓名_exp5.5.pdf

Deadline

12月3日 21：00

最后

请把你的题目部分添加到本github下面的评论区域，就像你的期中总结一样。

格式：(注意加粗和空行，为了好看些~)

学号：1555xxxx，姓名：张三

题目1： balabala题目内容

题目2： balabala题目内容

题目3： balabala题目内容

[wujr5]

Example

学号：1555xxxx，姓名：张三

题目1：

1. Is TA a homesome boy ? Please choose the right answer.
A. Yes, he is. 
B. Yes, he very is. 
C. Yes, he very very is. 
D. Yes, he very very very is.

题目2： balabala题目内容

题目3： balabala题目内容

[yzq986]

学号：15336226，姓名：叶子卿

题目1：

1. What's the output of following program:

int a;
void print(int x) {
    if (x > 5) return;
    cout << x << ' ';
    print(x ++);
}
int main() {
    a = 0;
    print(a);
    return 0;
}

A. 0 1 2 3 4 5 6 B. 0 1 2 3 4 5 C. 1 2 3 4 5 D. endless loop

题目2：

2. What's the output of following program:

int a;
void print(int x) {
    if (x > 5) return;
    cout << a << ' ';
    print(a ++);
}
int main() {
    a = 0;
    print(a);

    return 0;
}

A. 0 1 2 3 4 5 6 B. 0 1 2 3 4 5 C. 1 2 3 4 5 D. endless loop

题目3：

3. What's the output of following program:

int a;
void print(int x) {
    if (x > 5) return;
    cout << a << ' ';
    print(++ a);
}

int main() {
    a = 0;
    print(a);

    for(;;);
    return 0;
}

A. 0 1 2 3 4 5 6 B. 0 1 2 3 4 5 C. 1 2 3 4 5 D. endless loop

[SchroDeCat]

学号：15336237，姓名：张丰学

题目1 What is true about the following code:

int main() {
    string a,b;
    cin >> a;
    getline(cin,b);
    getline(cin,b);
    return 0;
}

A. if the input is “1 2”, a is “1”, b is “ 2”; B. if the input is “1 2”, a is “1”, b is “2”; C. if the input is “1” in the first line and “2” in the second line, a is “1”, b is “ 2”; D. if the input is “1” in the first line and “2” in the second line, a is “1”, b is “2”;

题目2 What is true about the following code:

int main() {
    const double PI = 3.1415926;
    cout << fixed << setprecision(2);
    cout << PI << endl;
    cout << setw(8);
    cout << PI << endl;
    cout << PI << endl;
    return 0;
}

A. the output are “3.1415926” in three different lines; B. the output are “3.14” in three different lines; C. the output are “3.14” in the first line and “ 3.14” in the following two lines. D. None of the above

题目3 What is true about the following code:

int main() {
    string a = "100";
    string b = "200";
    int c, d;
    stringstream mid;
    mid << a;
    mid >> c;
    mid << b;
    mid >> d;
    cout << a / b << endl;
    return 0;
}

A. The code can compile and run well B. The output will be 0.5 if ” cout << a / b << endl;” is changed into “”cout << c / d << endl;” C. The output will be 0.5 if ” cout << a / b << endl;” is changed into “”cout << (double)c / d << endl;” D. None of the above

[SgLy]

学号：15336251，姓名：郑树诚

---

Problem 1: What will happen to the following code?

#include <iostream>
using namespace std;

int main() {
    {
        int a;
        a = 5;
    }
    cout << a << endl;
    return 0;
}

A. Encounter a compilation Error;
B. Output: 5;
C. Encounter a run-time Error;
D. Output: 0.

---

Problem 2: What will happen to the following code?

#include <iostream>
using namespace std;

int main() {
    int b = 0;
    b = b++;
    cout << b << endl;
    return 0;
}

A. Encounter a compilation Error;
B. Output: 1;
C. Encounter a run-time Error;
D. Output: 0.

---

Problem 3: What will happen to the following code?

#include <iostream>
#include <climits>
using namespace std;

int main() {
    int a;
    a = INT_MAX + 1;
    cout << a << endl;
    return 0;
}

A. Output: 2147483648;
B. Output: -2147483648;
C. Encounter a run-time Error;
D. Output: -1.

Hint: pow(2, 31) == 2147483648
      INT_MAX == 2147483647

[EtherCS]

学号：15336242，姓名：张舰廷

题目1 What is true about the following code:

int main() { int a = 3; cout << a && true; cout << " ";
cout << (a && true) << endl; return 0; } A、1 1； B、3 1； C、1 0； D、compile error

题目2 What is true about the following code:

int qqb(int a = 1, int b = 2, int c) { return a + b + c; }
int main() { int x; x = qqb(10, 5); cout << x << endl; return 0; }

A、15； B、16； C、17； D、compile error

题目3 What is true about the following code:

int main() { int x = 0, y1, y2, y3, y4; y1 = (x++, x) ? 1 : 0; x = 0; y2 = (++x, x) ? 1 : 0; x = 0; y3 = (x, ++x) ? 1 : 0; x = 0; y4 = (x, x++) ? 1 : 0; cout << y1 << " " << y2 << " " << y3 << " " << y4 << endl; return 0; } A、1 1 1 1； B、0 1 1 1； C、1 1 1 0； D、0 1 1 0；

[zhuzq5]

学号：15336267 姓名：朱志强 题目1：what’s the output of the following program？

include

using namespace std; int main() { int a = 0; int b = a ++; int c = ++ a; cout << b <<" "<< c; } A.1 1 B.0 1 C.1 0 D.0 2 题目2：what’s the output of the following program？

include

using namespace std; int s (int& b) { b ++; return b; } int main() { int b = 1; cout << s (b); cout << " " << b; } A.1 1 B.1 2 C.2 2 D.None of above 题目3：what’s the output of the following program？

include

using namespace std; int main () { bool s = -1; if (s == 1) { cout << "Hello World!"; } else cout << "Error"; } A.Hello World！ B.Error C.Compile error D.Noting

[no553216989]

学号：15336228 姓名：于博洋

题目1

1.What is the output of the following program

include

using namespace std; int main(){ int i=1; cout << i++ + i++ << endl; }

a.3 b.4 c.5 d.6

题目2 2.What is the output of the following program

include

using namespace std; int main(){ int i=1; cout << ++i + ++i << endl; } a.3 b.4 c.5 d.6

题目3 3.What is the output of the following program

include

using namespace std; int main(){ int i=1; cout << ++i + ++i + ++i<< endl; } a.6 b.8 c.10 d.12

[HELLKING66666]

学号：15336257， 姓名：钟晓庆

---

题目1：

1. What's the output of following program:

#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int main() {
    string s1 = "5  complete";
    istringstream s2(s1);
    int m;
    s2 >> m;
    cout << m << endl;
return 0;
}

A. Encounter a compilation Error.
B. Output: 5.
C. Encounter a run-time Error.
D. Output: 5 complete.

题目2：

2. How many times is letter ‘a’ be printed? :

#include <iostream>
using namespace std;

int main()  {
    int i = 0;
    for( i; i < 10; i++) {
        }
    cout << “a” << endl;

A: 10.
B: Compiler Error.
C:Runtime Error.
D:1.

题目3：

3. What’s the output of the following code? :

#include <iostream>
using namespace std;

int main() {
int n = 1;
while(n--) {
        cout << n << “ ”;
}
return 0;
}

A: 1 0.
B: 0.
C: Nothing
D: Compiler Error.

[AK323]

学号：15337020， 姓名：施志雄

题目1 What is the value in count after the following loop is executed? int count = 0; do { cout << "Welcome to C++"; } while (count++ < 9); cout << count; A. 8 B. 9 C. 10 D. 11 题目2 int number = 25; int i; bool isPrime = true; for (i = 2; i < number && isPrime; i++)  {    if (number % i == 0)    {      isPrime = false;    } } cout << "i is " << i << " isPrime is " << isPrime << endl; A.i is 5 isPrime is 1 B. i is 5 isPrime is 0 C. i is 6 isPrime is 1 D. i is 6 isPrime is 0 题目3 What is the output of the following program?

include < iostream >

using namespace std; int main() {    int a = 5;    float b;    cout << sizeof(++a + b);    cout << a;    return 0; } A. 2 6 B. 4 6 C. 2 5 D. 4 5

[YxMa666]

姓名：马玉玺　　　学号：15337016 1题目 1.1题目 What is the output of the following code? double a[3] ={1.1,2.2,3.3}; cout<<a[0]<<” “<<a[1]<<” “<<a[2]<<endl; a[1] =a[2]; cout<<a[0] <<” “<<a[1] <<” “<<a[2] <<endl;

1.2题目 What is the output of the following code? Int i, temp[10]; For (i=0;i<10;i++) Temp[i]=2*i; For (i=0;i<10;i++) cout<<temp[i]<<” “; Cout<<endl; For (i=0;i<10;i=i+2) Cout<<temp[i]<<”＂； 1.3题目 What is the output of the following code? int count=3; while （count-->0） cout<<count<<" ";

[MattMu]

学号：15337017 姓名：牟者斌

problem1

What is the output of the following program?

#include <iostream>
 using namespace std;
 void addprint()
 {
   static int s = 1;
   s++;
   cout << s;
}
int main()
{
   addprint();
   addprint();
   addprint();
   return 0;
}

A. 234 B. 111 C. 235 D. 123

problem2

What is the output of the following program?

#include <iostream>
using namespace std;
int main() {
  int a = 5;
  double b;
  cout << sizeof(++a + b);
  cout << a;
  return 0;
}

A. 2 6 B. 4 6 C. 2 5 D. 4 5 E. None of mentioned

problem3

What is y after the following statement is executed?

int x = 3; int y = 4;
if (( x ) || ( x > 3))
 switch (x + 3) {
  case 6: y = 0;
  case 7: y = 1;
  default: y += 1;
}
y = y++ + ++y;

A. 2 B. 4 C. 6 D. 8

[Icenowy]

0 简介

姓名:郑兴达 学号: 15336253

1 题目

1.1 题目 1

Which command can compile test.cpp and get a test.exe debuggable with GDB? A. g++ -DDEBUG test.cpp -o test.exe B. g++ test.cpp -g -o test.exe C. gcc test.cpp -g -o test.exe D. gdb test.cpp -o test.exe

1.2 题目 2

If I want to break before outputing variable out in the program shown below, what GDB command should I use?

01:#include <iostream>
02:using namespace std;
03:
04:int main()
05:{
06:int out = 10;
07:out *= 20;
08:cout << out << endl;
09:return 0;
10:}

A.bt 8 B.b 8 C.cont D.set args 8

1.3 题目 3

The source code of test.cpp (compiled into test.exe) is shown below:

#include <iostream>
using namespace std;
int main()
{
cout << "a" << endl;
cerr << "b" << endl;
}
return 0;

If I run D:\CS-Basic> test.exe > a.txt, What will occur? A. Nothing printed, but the content of a.txt is “ab” (without “”). B. “a” is printed, the content of a.txt is “b” (without “”). C. “b” is printed, the content of a.txt is “a” (without “”). D. “ab” is printed, nothing's in a.txt.

[yyh15336238]

学号：15336238 ， 姓名：张皓宇 题目1： Problem 1 How many times will 'Hello' and 'World' be printed respectively?

include

using namespace std; void print (string, int); double count (int a, int b = 3, int c = 6) { double count = a + b + c; return count; } void swap (int a, int b) { int temp = a; a = b; b = temp; } int main() { int a = 4; int b = 7; print ("Hello", 2); swap (a, b); print ("World", a); return 0; } int a; void print (string ch, int n) { if (n == 4) return; n = count(a, 0); n++; for (int i = 0; i < n; i++) cout << ch << endl; } A.7,12. B.7,5. C.7,0. D.7,7.

题目2： Problem2 Which is the correct output?

include

using namespace std; double a (int a,int b = 1,int c = 2) { double q = a + b + c; cout << q << " "; }

int main() { cout << a(4, 2) << " "; cout << a (4, 3, '2') << " "; } A.8 8 9 9. B.8 0 9 0. C.8 0 57 0. D.compile error.

题目3： Problem3 To satisfy output Champion1234,what is the value of x and y,and the value of strlen(a) at last?

include

include

using namespace std; int main() { char a[] = "Champion12 34"; memmove (a+x, a+y, strlen(a)); cout << a << " "; cout << strlen(a); return 0; } A.11 12 12. B.12 11 13. C 10 11 12. D.11 10 13.

[littleicemelon]

学号：15338259 姓名：周俊澎 题目1：what is i after the following for loop? int y = 0; for (int i = 0; i < 10; ++i) { y += i;} A. 9 B. 10 C.11 D.undefined 题目2：pow(4.0, 1/2)returns A. 0 B. 1 C. 2 D. 3 题目3：What is the output of the following code:

int list[] = {1, 2, 3, 4, 5, 6};

for (int i = 1; i < 6; i++)
  list[i] = list[i - 1];

for (int i = 0; i < 6; i++)
  cout << list[i] << " ";

A. 1 2 3 4 5 6 B. 2 3 4 5 6 6 C. 2 3 4 5 6 1 D. 1 1 1 1 1 1

answer：DBD

[zbwBerwin]

学号：15336249 姓名：郑博文 题目1 What’s the output of the following code?

include

using namespace std;

int main() { int a = 1; a = a++ + ++a; cout << a ; a = ++a + a++; cout << a << endl; return 0; } A.4 5 B.5 5 C.4 10 D.4 11 题目2 What’s the output of the following code?

include

using namespace std;

int main(){ int a = 1; if(a--){ cout << "true " ; } else cout << "false "; if(a = 0){ cout << "true" << endl; } else cout << "false" << endl; return 0; } A.true true B.true false C.false true D.false false 题目3What’s the output of the following code?

include

include

using namespace std;

int main(){ cout << (double)pow(4,(double)(1/2)) <<endl; return 0; } A.2 B.2.0 C.1 D.1.0

[yyh15336247]

学号：15336247 姓名：赵维俊 题目1 What is the output of the following code? ( )

include

using namespace std; int main() { int a[10] = {1, 2, 3, 4, 5, 6, 7, 8}, i; for (i = 0; i < 10; i ++) { cout << a[i] << " "; } return 0; } A.The program has a compile error. B.1 2 3 4 5 6 7 8. C.None of the above D.1 2 3 4 5 6 7 8 9 10 题目2 What is the output of the following code? ( )

include

using namespace std; void f(int n) { n ++; cout << "x is " << n << endl; } int main() { int x = 1; cout << "x is " << x << endl; f(x); if (x == 2) { cout << "x is " << x << endl; } return 0; } A. X is 1 X is 2 B. X is 1 X is 2 X is 1 C. X is 1 X is 2 X is 2 D. X is 1 X is 1 题目3 Analyze the following code: ( )

include

using namespace std; int main() { int a[3][3] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; for (int i = 0; i < 3; i++) { cout << a[i][1] << " "; } return 0; } A. The program has a compile error. B. The program runs fine and displays 2 5 8. C. The program runs fine and displays 1 4 7. D. The program runs fine and displays 1 2 3.

[my2599]

学号：15336232，姓名：余木建 题目1 1.What is the output of the following program?

 Int main() {
    int x = 1;
    int a = x++ + 5;
    int b = ++x + 5;
    cout << x << a << b;
}

A.168 B.367 C.368 D.357

题目2 2.What is the output of the following program?

int main() {
    cout << setw(6) << "abc" << "def" << endl;
    cout << setw(6) << "abc" << setw(6) << "def";
}

A.(3 space) + abcdef; (3 space) + abc + (3 space) + def B. (3 space) + abc + (3 space) + def; (3 space) + abc + (3 space) + def C.(3 space) + abcdef;(3 space) + abcdef D. None of the above

题目3 3.What is the output of the following program?

Int main() {
  int s;
  for(int i = 0; i++; i < 10) {
    s += 1;
  }
  cout << s;
}

A.9 B.10 C.0 D.None of the above

[zhaocheng123]

学号：15336244，姓名：赵成 题目 1： What is the value of the following expression using “ cout ” to output : (1) 0/0 (2) 0/0.0 (3) 1.0/0.0 A. (1) Compile error (2) Compile error (3) Compile error B. (1) Running error (2) inf (3) Compile error C. (1) Running error (2)nan (3)inf D. (1) Compile error (2)nan (3) Running error 题目 2： What is the running result of the following code？

include

using namespace std; int main( ) { double i; for(i = 0; i != 10; i += 0.1) cout << i << endl; return 0; } A．0 0.1 …… 9.9 B．0 0.1 …… 10 C . The program will not stop 题目 3：

X = 11 , then the expression (x++*1/3)’s value is ( ) A. 3 B. 4 C. 11 D. 12

[zhmy127999]

学号：15336239 姓名：张弘

题目一

Which of the following might cause an error?
A.  char text[]=”Good”;
B.  char text[]={‘G’,’o’,’o’,’d’};
C.  char text[5]= {‘G’,’o’,’o’,’d’};
D.  char text[]={‘G’,’o’,’o’,’d’,0};

题目二

What is the return value for f(4) after calling the following function?

int f(int n){
    if(n==1)
    return 1;
    else 
    return n+f(n-1);
}

A.9 B.10 C.11 D.12

题目三

Analyze the following program fragment:

double sum=0;
double d=0;
while (d!=10.0){
    d+=0.1;
    sum+=d; 
}

A. The program does not compile because sum and d are declared double, but assigned with integer 0 B. The program never stops because d is always 0.1 inside the loop. C. The program may not stop because of the phenomenon referred to as numerical inaccuracy for operating with floating-point numbers. D. After the loop, sum is 0+0.1+0.2+0.3+…..+1.9

[wowtalon]

学号：15336268，姓名：庄书琪

题目1：Suppose a = 5, b = 4 and c = 7, d = 3, what will the following program output?

#include<iostream>

using namespace std;

int main() {
  if( a >= 5 && b < 5 || d < 5 && c >= 5) {
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}

A.YES B.NO C.YESNO D.None

题目2：Suppose a = 1, what will the following program output?

#include<iostream>

using namespace std;

int main() {
  int a = 1;
  int b;
  b = a++ + ++ a;
  b / = a;
  cout << b << endl;
  return 0;
}

A.1 B.1.333333 C.2 D.0

题目3：Suppose a = -25, b = 4, what will the following program output?

#include<iostream>

using namespace std;

int main() {
  int a = -25, b = 4;
  cout << a % b << endl;
  return 0;
}

A.1 B.-1 C.0 D.none

[yonglc]

学号：15336227 姓名：雍灵聪

题目一 下面的代码会输出什么： A．YES B. 2 C. YES 2 D.3

include

using namespace std; int main() { int x = 1 ; int y = 2 ; if ( x >2 && ++y) { cout << "yes" << endl; } cout << y << endl; return 0 ; }

题目二 下面的代码会输出什么： A．1 2 B.2 3 C.2 1 D.2 2

include

using namespace std; int main() { bool a = 1 ; cout << a + 1 << endl; a = a + 1 ; cout << a << endl; return 0 ; }

题目三 下面的代码会输出什么： A．1 B.0

include

using namespace std; int main() { unsigned a = -1; int b = 2; bool k = 0; if (a > b) k = 1; cout << k << endl; return 0; } 答案：B C A

[yejialiang]

学号：15336224 姓名：叶家梁 题目1 1.what’s the output of following program:

include

using namespace std; int main() { int i = 0; int ans = 1; while (i++) { if (i++ > 5) { break; } ans = ans + i;
} cout << ans << endl; return 0; } A.10 B.15 C.21 D.1 题目2 2.what’s the output of following program:

include

using namespace std; int main() { int a = 1; int b = (a++,++a); cout << a << " " << b << endl; return 0; } A.3 2 B.3 3 C.2 2 D.2 3 题目3 3.what’s the output of following program:

include

using namespace std; int main() { int i = 1; for (;i++ < 5;) { cout << i << " "; } return 0; } A.1 2 3 4 5 B.1 2 3 4 C.2 3 4 D.2 3 4 5

[Kunlun-Zhu]

学号：15336264 姓名：朱昆仑 题目一： What is the output of this program?(based on dev c++ 5.10) int main() { int a,b; double c,d; a=1.999999999999999; cout<<a<<" "; b=1.9999999999999999; cout<<b<<" "; c=1.99999; cout<<c<<" "; d=1.999999; cout<<d<<" "; cout<<setprecision(6)<<d<<" "; cout<<setprecision(7)<<d<<" "; cout<<fixed<<setprecision(2)<<d<<endl; return 0; } A.1 1 1.99999 1.999999 1.9999 1.999999 1.99 B.1 2 1.99999 2 2 1.999999 2.00 C.1 1 2 2 1.99999 2 2.00 D.1 2 1.99999 1.999999 2 2 1.99 题目二： What is the output of this program?(based on dev c++ 5.10)

include

include

using namespace std;

int main() { if(1 - 0.1 == 0.9) cout<<"1"<<" "; if(1 - 0.1 -0.1 != 0.8) cout<<"false"<<" "; if(1 - 0.1 - 0.1 - 0.1 != 0.7) cout<<false<<" "; if(1 - 0.1 - 0.1 -0.1 - 0.1 -0.1 == 0.5) cout<<true<<" "; if(abs(1 - 0.1 - 0.1 - 0.1 - 0.1 - 0.1 - 0.5 )<1E-14) cout<<"true"<<endl; return 0; } A.1 false false true true B.1 false 0 1 true C.1 true D.1 0 true E.1 false 0 true 题目三： What is the output of this program? int main() { char a = 'a'; char b = b; switch( a ){ case 97:cout<<a<<" "; case 98:cout<<"b"<<" "; default:a=b; } cout<<a<<endl; return 0; } A.nothing B.a C.a b D.a b b E.97 F. Compile error

[PengzeZhang]

学号：15336243，姓名：张鹏泽 题目1：Suppose n = 8, what will the following program output?

#include<iostream> 
using namespace std;
int main(){
    int n = 8, i;
    for (i = 0; i <= n;i++ + ++i){
        cout << i << endl;
    }
    return 0;
}

A. 0 2 6 B. 0 2 6 8 C. 0 2 4 6 8 D. compile error 题目2：Suppose x = 2, y = 5 what will the following program output?

#include<iostream>
using namespace std;
int main(){
int x = 2, y=5;
switch(x+=2){
     case 2: y =0; break;
     case 4: y = 1; break;
     default: y+=1;
}
cout<<y<<endl;
return 0;
}

A. 0 B. 1 C. 5 D. 6 题目3：Suppose x = 0, y = -3, z = 3 what will the following program output?

#include<iostream>
using namespace std;
int main(){
    int x = 0, y = -3, z = 3;
    if (x > 0||x==0)
    if (y > 0)
    cout<<"x > 0 and y > 0";
    else if (z < 0)
    cout<<"x < 0 and z < 0";
    else if (z > 0)
    cout<<"x > 0 and z > 0";
return 0;
}

A. x > 0 and y > 0 B. x < 0 and z < 0 C. x > 0 and z > 0 D. no output

[Kunlun-Zhu]

学号：15336264 姓名：朱昆仑 int main() { int a,b; double c,d; a=1.999999999999999; cout<<a<<" "; b=1.9999999999999999; cout<<b<<" "; c=1.99999; cout<<c<<" "; d=1.999999; cout<<d<<" "; cout<<setprecision(6)<<d<<" "; cout<<setprecision(7)<<d<<" "; cout<<fixed<<setprecision(2)<<d<<endl;

return 0;

} A.1 1 1.99999 1.999999 1.9999 1.999999 1.99 B.1 2 1.99999 2 2 1.999999 2.00 C.1 1 2 2 1.99999 2 2.00 D.1 2 1.99999 1.999999 2 2 1.99 题目二： What is the output of this program?(based on dev c++ 5.10)

include

include

using namespace std;

int main() { if(1 - 0.1 == 0.9) cout<<"1"<<" "; if(1 - 0.1 -0.1 != 0.8) cout<<"false"<<" "; if(1 - 0.1 - 0.1 - 0.1 != 0.7) cout<<false<<" "; if(1 - 0.1 - 0.1 -0.1 - 0.1 -0.1 == 0.5) cout<<true<<" "; if(abs(1 - 0.1 - 0.1 - 0.1 - 0.1 - 0.1 - 0.5 )<1E-14) cout<<"true"<<endl; return 0; } A.1 false false true true B.1 false 0 1 true C.1 true D.1 0 true E.1 false 0 true 题目三： What is the output of this program? int main() { char a = 'a'; char b = b; switch( a ){ case 97:cout<<a<<" "; case 98:cout<<"b"<<" "; default:a=b; } cout<<a<<endl; return 0; } A.nothing B.a C.a b D.a b b E.97 F. Compile error

[lishibang]

学号：15337012 姓名：李世帮

题目1 How many times will the following code print "Welcome to C++"?

int count = 0; while (count++ < 10) { cout << "Welcome to C++"; } A．8 B．9 C．10 D．11 E．0

题目2 What is the output of the following code?

int count = 0; do { cout << count << " "; } while (count < 5); A．1 2 3 4 5 B. 2 3 4 5 C. 0 1 2 3 4 5 D. 0 1 2 3 4 E. The program has an infinite loop

题目3 How many times will the following code print "Welcome to C++"?

int count = 0; do { cout << "Welcome to C++"; } while (++count < 10); A．8 B．9 C．10 D．11 E．0

[windyd2]

学号：15336259， 姓名：周思聪

题目一：

1、    Which of the following statement is valid?
        const int i = 12;
A.  int *ptr1 = i;
B.  int const *ptr2 = &i;
C.  const int *ptr3 = &i;
D.  const int const *ptr4 = &i;

题目二：

2、    Which of the following statement is valid?
int i = 12;
A.  int *ptr1 = i;
B.  int const *ptr2 = &i;
C.  const int *ptr3 = &i;
D.  const int const *ptr4 = &i;

题目三：

3、    Which of the following statement is valid?
int num[] = { 1, 2, 3 };
A.  int *ptr1 = #
B.  int *ptr2 = num;
C.  int *ptr3 = num[0];
D.  int *ptr4 = &num[0];
E.  int *ptr5 = &num[3];

[ZhaoMinda123]

学号：15336246 姓名：赵敏达 题目1 What's the output of the following code?

include

using namespace std;

int main() { int a = 8; cout << "The answer is " << a && true; return 0; }

A. 1 B. 8 C. 1/8 D. compile error

题目2 What's the output of the following code?

include

using namespace std;

int main() { int i = 2; i = i++ + ++i + i++; cout << i; return 0; }

A. 9 B. 10 C. 11 D. compile error

题目3 What's the output of the following code?

include

using namespace std;

int main() { int a = 2; int b = 3; double c = 3.0; cout << b / a << endl << c / a << endl; return 0; }

A. 1.5 1.5 B. 1.0 1.5 C. 1 1.5 D. 1 1

[Z-Zhijie]

学号：15336258，姓名：钟志杰

题目一：

How many times will the following code print "ahaha" ?

#include <iostream>
using namespace std;
int main ()
{
    for (int i = 0; i < 5; ++i)
    {
        for (int j = 0; j < 3; ++j)
        {
            cout << "ahaha" << endl;
            if (j == 1) {
                break;
                break;
            }
        }
    }
}

A: 2 times;
B: 10 times;
C: 15 times;
D: Invalid;

题目二：

What`s the output of the following code?

#include <iostream>
using namespace std;
int ahaha(int i) {
    cout << "ahaha" << endl;
    return i;
}
int main() {
    cout << "hhh" << ahaha(1);
}

A: hhhahaha
    1;
B: hhh1ahaha;
C: ahaha
     hhh1;
D: ahaha
     1hhh;

题目三：

What`s the output of the following code?

#include <iostream>
using namespace std;

int main() {
    double i = 1;
    double sum = 0;
    while (i != 0) {
        sum += i;
    }
    cout << sum << endl;
    return 0;
}

A: 5.5;
B: 5.4;
C: Run Time Error;
D: Compile Error;

[zhongjh97]

学号：15336256，姓名：钟钧豪

题目1：

1. How to print " "\t" is a tab character. " ?
A. cout << ""\\t" is a tab character.";
B. cout << "\"\\t\" is a tab character.";
C. cout << "\t is a tab character.";
D. cout << "\"\t\" is a tab character.";

题目2：

2. What is the output of the following program?

#include <iostream>
using namespace std;

int main() {
    int a = 3, b = 2, c = 5;
    a = b + c %= a % b;
    cout << a << " " << b << " " << c;
    return 0;
}

A. 2 2 0
B. 2 2 2
C. 3 2 5
D. Compile error

题目3：

3. What is the output of the following program?

#include <iostream>
using namespace std;

int main() {
    int i = 0;
    for (i++, i++; i++ < 20; i++ + i++); {
        cout << i++ << " ";
    }
    return 0;
}

A. 2 6 10 14 18
B. 3 7 11 15 19
C. 21
D. Compile error

[HiDarling]

学号：15336269 姓名：邹琳 题目1 What is the value of the following expression? true || true && false a.true b.false 题目2 What is y after the following switch statement is executed? int x = 3; int y = 4; switch (x + 3) { case 6: y = 0; case 7: y = 1; default: y += 1; } a.0 b.1 c.2 d.4 题目3 Is there anything wrong with the following program？ int radius = 2； if（radius > 0）; { area = radius * radius * 3.14; cout << “ the area is “ << area; } a.it has a compile error b.it has a runtime error c.it has a logic error d.nothing is wrong

[uitrbn]

学号：15336245 姓名：赵赣龙 题目一： 1What is the output of the following program?

include

using namespace std; int main() { int a = 3, b = 4, c = 5; cout << ((a + b)>c&&b == c) << endl; return 0; } A 1； B 0;

题目二 2what is the output of the following program?

include

using namespace std; int main() { int a[9] = { 2,4,6,8,10,12,14,16,18 }; for (int i = 0; i < 9; ++i) { cout << *(a + i) << " "; } } A.2,4,6,8,10,12,14,16,18; B.18,16,14,12,10,8,6,4,2;

题目三： 3what is the output of the following program?

include

using namespace std; int main() { int a = 1, b = 0; if (a, b) cout << 1 << endl; } A.1; B.nothing;

[yujiangyu]

学号：15336231 名字：余江裕 题目一： what is the output of program? (suppose: sizeof (short)==2)

include

using namespace std; int main() { unsigned short a = 1; short count = 0; while (a ++ ) count ++; cout << count << endl; } A.-1 B. 0 C. It’s an endless loop so there is no output. D. 2^32 -1

题目二： what is the output of program?

include

using namespace std; long write(int x) { cout << "write函数中" << endl; return x-1; } int main () { int temp = 1; if (write(temp)) cout << temp << endl; } A.no output B.在write函数中 1 C.1 D.在write函数中

题目三： which is the really output in the next four choices?

include

using namespace std; int b=1; void masayume(int& a) { a = (b = a + b, a + b); return; } int main() { int a = 1,b = 0; if (sizeof(iostream)) { masayume(a); cout << a << “ “ << b << endl; } else cout<<"_^o^_//"<<endl; } A.compile error B.3 0 C.2 2 D.^o^//

[akbkon]

学号:15336241 姓名：张剑雄

题目1 What does the following code print? int i = 2; int j = 1; int k = 3; cout << (i > j ? i > k ? i : k : j > k ? j : k) << endl; a. 1 b. 2 c. 3 题目2 What will the following code print? int i = 3; int j = 5; int k = 4; if ( i < j < k ) { cout << “a” << endl; } a. a b. error c.no print. 题目3 string a[5]; for (int i = 0; i < 2; i++) { a[i] = ‘s’; } a[3] = ‘d’; for (int i = 0; i < 5; i++) { cout << a[i] ; } cout << “q”; a.aadq b.aa dq c.aa d q

[yuxd5]

学号：15336234 姓名：余旭达 题目一：What's the output of following program:

int main(){
    int n = 8, i;
    for (i = 0; i <= n; i = i++ + ++i){
        cout << i << endl;
    }
    return 0;
}

A.  0  2  4  6  8
B.  0  4  8
C.  0  2  6
D.  compile error

题目二：What's the output of following program:

int main()
{
    double a = 3.1415926;
    int b = a;
    cout << setprecision(6) << setw(8);
    cout << a << endl << b<< endl;
    return 0; 
}

A.  (two space)3.14159
3
B.  (two space)3.14159
(seven space)3
C.  (two space)3.14159
(two space)3.14159
D.  3.1415926
3

题目三：What's the output of following program:

int main() {
    string a = "10*10";
    int b;
    stringstream mid;
    mid << a;
    mid >> b;
    cout << b << endl;
    return 0;
}

A.  10*10;
B.  100;
C.  10;
D.  compile error;

[mj397062482]

学号：15337024，姓名：韦汕 一些容易混淆，分不清，回答含糊不清的问题，希望引起注意。 题目一 What is the output of the below code? int main () { int a = 0, b = 0, c = 0; cout << a++ <<" "<< ++a << endl; cout << ++b <<" "<< b++ << endl; cout << c-- <<" "<< -c-- << endl; return 0; } A) .1 2 B).1 1 C).1 2 D). 1 1 2 0 1 1 2 1 1 0 -1 0 1 0 1 0 -1 0

题目二 . What is the output of the following code? int main () {
int a = 1; if (a = 2) cout << "1" << endl; else cout << "2" << endl; } int main () {
int b = 1; if (b == 2) cout << "1" << endl; else cout << "2" << endl; } A).1 1 B).1 2 C).2 1 D).2 2 题目三 Arguments to functions always appear within __. A). brackets B). parentheses C). curly braces D). quotation marks

[ghost]

学号：15337021 姓名：苏毅

题目一：Is the following code correct ?

int size = 4;
double array[size];

A. Correct B. Wrong C. Sometimes correct, sometimes correct D. I don’t know

题目二：Is the following code correct ?

const int size = 4;
double array[size] = (1, 2, 3, 4);

A. Correct B. Wrong C. Sometimes correct, sometimes correct D. I don’t know

题目三：What's the output of following program？

#include <iostream>
using namespace std;

void m(int, int []);

int main() {
  int x = 1;
  int y[10];
  y[0] = 1;

  m(x, y);

  cout << "x is " << x << endl;
  cout << "y[0] is " << y[0] << endl;

  return 0;
}

void m(int number, int numbers[]){
  number = 1001;
  numbers[0] = 5555;
}

A. x is 1 y[0] is 5555 B. x is 1001 y[0] is 5555 C. x is 1 y[0] is 0 D. x is 1001 y[0] is 0

[dayu11]

学号15336229， 姓名 于达 1： 题目一： What is the output of the following code? void plus(int x) { x++; } int main() { int x=1; plus(1); cout<<x<<endl; } A 1 B 2 C 3 D 4 题目二： Is there anything wrong with the following program？ int main() { int a; a=2^3.14; cout<<a<<endl; }

题目三： What is the output of the following code?
int main() { char a=88; cout<<a<<end; }会显示什么？ A 'X' B 1234567 C 7654321 D 1593577

[snowdreamzcl]

学号：15336236 姓名：张春柳 题目1 What is the output ?

include

using namespace std;

int sum(int h,int k) { int sum = h + k; return sum; } double sum(int h,int k) { double sum = h + k; return sum; } int main() { cout << sum(1, 2); return 0; } a.3 b.3.0 c.compile error

题目2： What is the output ?

include

using namespace std; int y = 1; int t() { int y = 2; return y; } int main() { cout << t() << " " << y; return 0; } a.2 2 b.1 1 c.2 1

题目3： what is kind of the error is?

include

using namespace std; void output(int i) { int i = 5; cout << "i is " << i; } int main() { int i = 3; output(i); return 0; } a.logic error b.compile error c.syntax error

[hhhhanli]

学号：15336240 姓名：张慧龙 题目一：What's the output of the two programs in DEV C++:

include

using namespace std; //（A） int main() { int i = 1; cout << i ; return ; } // （B） void main() { int i = 1; cout << i ; return ; } A. 1 , 1 ; B. compile error , 1 ; C. 1 , compile error ; D. compile error , compile error ; 题目二：What's the output of the following program:

include

using namespace std; int main() { char a = 'a'; char b = 'b'; cout << (char)( b - a) * ( b - a) << endl; } A. 1 ; B. compile error ； C. a ; D. b ; 题目三：What's the output of the following program:

include

using namespace std; int main() { int i = 1; i+= i ++ ; cout << i; return 0; } A. 1 ; B. 2 ; C. 3 ; D. compile error;

[zzz0906]

0、 简介 姓名：周中柱 学号：15336262 出题初衷：因为错过 1、 题目 (1) Which of following choices is true? A、 For (int i = 1;i<=1) B、 For (int j;j<=k;) C、 For (j<=k;j++) D、 For(; ;); (2) what is the output of following program

include

include

Int main() { Cout<<fixed<<setprecision(2); Double a = 0.5; Cout<<a; } A. compile error B. 0.50 C. 0.5 D. No output (3) what is the purpose of using “time(0)” in srand A、 just get the time B、 just get a seed C、 get a different number and seed to avoid the same seed D、 to get a greatful number and let program more precise and randomize

[StealMyGirl]

学号：15336235 姓名：袁晨慧 题目1

题目2

题目3

[gggyyyzzz]

学号15337007 姓名 郭宇钊

1.Suppose char x = ‘9’, what is the printout of cout << x+1<<endl ? A) 0 B) 58 C) 10 D) ：
注：“9”的ASCII代码是57 . “：”的ASCII代码是58 2.what is the printout? Int i=3; cout<< i++ <<” “<< i++; A.3 4 B.3 3 C.4 4 D.4 3 3.What is the value of "(double)1/3*3 = = 1"?
A. true B. false C. 1 D. maybe true, maybe false

[1808510141]

姓名：赵文 学号：15336248 题目一： 1.What's the output of following program:

include

using namespace std; int f(int n, int m) { int temp; temp = n; n = m; m = temp; return m; } int main() { int m = 2, n = 3; cout << f(m, n) << " " << m << " " << n << endl; return 0; } A.3 3 2 B.3 2 3 C.2 2 3 D. 2 3 2 题目二： 2.What's the output of following program:

include

using namespace std; int main() { int a = 1, b = 2, x = 0, t; t = (x > 0 )?a : b; cout << t << endl;; return 0; } A. 1 B. 2 C. 0; D. Compile error 题目三： 3.What's the output of following program:

include

using namespace std; int main() { for (int i = 2; i < 100; i = i * i) { cout << i++ << " " << ++i << " "; } return 0; } A. 3 4 17 18 B. 4 4 18 18 C. 3 4 5 6 17 18 D.4 4 6 6 18 18

[zzzgggsix]

学号 14366108 姓名 詹博羽

1 题目 1.1 How many times will the following code print "Hello world!"?

int count = 1; do { cout << "Hello world!"; } while (count++ < 10); A. 8 B. 9 C. 10 D. 11

1.2 What is the output of the following code?

int a = 1, b, c, d; b = a++; c = ++a; d = a++ + ++a; cout << a << b << c << d; A. 5138 B. 5238 C. 5139 D. compile error

1.3 What is the value of y after the following code?

int y = 1, x = 2; y += x > y? x = 3 : x = -3; A. -2 B. 3 C. 4 D. compile error

[ghost]

学号：15337011 姓名：姜继钢 1.1题目1 What is y after the following switch statement is executed? x=1; switch(x+=1){ case 1: y =0; case 2: y = 1; default: y+=1; } A) 0 B) 1 C) 2 D) 3

1.2题目2 Which of the following statements can execute successfully? A)double x[5]; cout << x[5]; B) int x; cin >> x; int b[x]; C) char ch[10]; cin >> ch; D) double d[3]; d = {1, 2, 3};

1.3题目3 s1 = asdfga; s2 = a; What is the output of the following program?

include

include

using namespace std; int main (){ string s1, s2; cin >> s1 >> s2; for (int i = 0; i < s1.length(); i++){ for (int l = 0; l < s2.length(); l++){ if (s2[l] == s1[i]) { s1 = s1.erase(i,2); i--; } else continue; } }

cout << s1;
return 0;

} A） asd B） sdfg C） dfg D） afga

[wanna295]

学号：15337025 姓名：肖芳松

[YX-Huang]

学号：15337009 姓名：黄彦雄

1. Which of the following function declaration is legal? A. void n (int x, int y = 0, int z); B. void n (int x = 0, int y = 0; double z); C. void n (double x, int y = 0; int z = 1); D. void n (int x, y, z);
2. Which of the following call is fine? A. n ( , , 2); B. n ( , 2, ); C. n (2, , 3); D. n (1);
3. What is the output of the following code? int n = 1; cout << --i << “ ” << i++; A.2 2 B.1 1 C.2 1 D.1 2

[zhuxy97]

学号：15336266 姓名 ：朱晓月 1.1题目1 What’s the output of the following code?

include

using namespace std;

int main() { int a, b, c; b = ++a + a++; c = a++ + ++a; cout << b << c << endl; return 0; } A.22 B.24 C.35 D.36 1.2题目2 Which of the following code the result of the code is the same? 1.int a = 0, sum = 0; while (a++ < n ) { sum = sum +a; } cout << sum << endl; 2.int a = 0, sum = 0; for (a = 0; a < n ;a++ ) { sum = sum +a; } cout << sum << endl; 3.int a = 0, sum = 0; do { sum = sum +a; } while (a++ < n ) cout << sum << endl; 4.int a = 0, sum = 0; do { sum = sum +a; } while (++a < n ) cout << sum << endl; A .1,2 B .1,3 C. 1,2,3 D. 1,2,4 1.3题目3 intc; double a, b; a=static_cast(5)/2; b=static_cast(5/2); c=static_cast(5)/2; A. 2.5 2.0 2 B. 2.5 2.0 2.0 C. 2.5 2 2.0 D. 2.0 2.0 2

[yyh15337028]

学号：15337028，姓名：郑正平

题目1：What's the output of following program?

#include<string>
using namespace std;

int main()
{
    int n=5;
    int i,a,b,c,d;
    a=0; 
    for ( i=0; i<n; i++)
         { 
        a++;
         }
    cout<<a<<" "<<i;
    b=0;
    while(n != 0)
         {
          b++;
          n--;
         }
   cout<<b<<" "<<n<<endl;
   return 0;
 } ```
```cppA: 5 4 5 0;
B: 5 4 6 0;
C: 5 5 5 0;
D: 5 5 6 0;```

题目2：What's the output of following program?
```cppint main()
{  
    string a="Yes No";
    int n;
    cin>>n;

    a.erase ( n,3 );

    cout<<"TA is very handsome,isn it? "<<a<<endl;
    return 0;
}```
```cppA: The output is "TA is very handsome,isn it? Yes" when n=3;
B: The output is "TA is very handsome,isn it? Yes" when n=0;
C: The output is "TA is very handsome,isn it? No" when n=3;
D: The output is "TA is very handsome,isn it? No" when n=0;```

题目3：What's the output of following program?
```cpp
int max(int &a,int b)
{   
    a=a+b;
    if (a>b) 
    {
     return a;
     a=a+b;
    }
    else 
    {
     return b;
     b=a+b;
    } 
}

int main()
{
    int x,y,m;
    x=3; y=1;
    m=max(x,y);
    cout<<m<<" "<<x<<" "<<y<<endl;
    return 0;
}```
```cpp
A:4 4 1;
B:3 3 1;
C:4 3 1;
D:3 4 1;```