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9 years ago 答案，请大家搞懂为什么
1. What's the output of the following program:
#include <stdio.h>
int main() {
int n = 1, m = 4;
while(n = 1) {
m--;
n--;
}
printf("%d %d\n", n, m);
return 0;
}A. 1 -1
B. 1 0
C. Dead Loop
D. 0 0
answer: C
2.What's the output of the following program:
#include<stdio.h>
int main() {
int a=4,b=8,c=5;
int d1,d2,d3,d4;
d1=(a<b)||(++a==5)||(c>b--);
printf("d1=%d,a=%d,b=%d,c=%d\n",d1,a,b,c);
d2=(a>b)&&(++a==5)||(c>b--);
printf("d2=%d,a=%d,b=%d,c=%d\n",d2,a,b,c);
d3=(a<b)||(++a==5)&&(c>b--);
printf("d3=%d,a=%d,b=%d,c=%d\n",d3,a,b,c);
d4=(a>b)&&(++a==5)&&(c>b--);
printf("d4=%d,a=%d,b=%d,c=%d\n",d4,a,b,c);
return 0;
}A.
d1=1,a=5,b=7,c=5
d2=0,a=6,b=6,c=5
d3=0,a=7,b=5,c=5
d4=1,a=8,b=6,c=5
B.
d1=1,a=5,b=7,c=5
d2=1,a=6,b=6,c=5
d3=1,a=7,b=5,c=5
d4=0,a=8,b=6,c=5
C.
d1=1,a=4,b=8,c=5
d2=0,a=4,b=7,c=5
d3=1,a=4,b=7,c=5
d4=0,a=4,b=7,c=5
D. Compile error
answer: C
3.What's the output of the following program:
#include<stdio.h>
int main() {
int a = 2, b = 3, c = 4;
printf("%d %d",c > b > a, c < b < a);
return 0;
}A. 0 0
B. 0 1
C. 1 0
D. 1 1
answer: B
4.What's the output of the following program:
#include<stdio.h>
int main() {
int a = 3, b = 4, c = 5;
int d = (a + b) + c - 1 && b + c / 2;
printf("%d\n", d);
return 0;
}A. 13
B. 1
C. 3
D. Compile error
answer: B
5.What's the output of the following program:
#include<stdio.h>
int main() {
float x = 2.5, y = 4.7;
int a = 7;
printf("%.1f\n", x+a%3*(int)(x+y)%2/4);
return 0;
}A. 2.5
B. error: invalid operands to binary %
C. 0.0
D. 1.2
*answer:** A
6.Expression !x||a==b is Equivalent to
A. !((x||a)==b)
B. !(x||y)==b
C.!(x||(a==b))
D.(!x)||(a==b)
answer: D
7.What's the output of the following program:
#include<stdio.h>
int main() {
int i = -2;
int n = ++i == 0 ? 99 : (i == -1 ? 11 : 22);
printf("%d\n", n);
return 0;
}A.22
B.Compile error
C.0
D.11
answer: D
8.What's the output of the following program:
#include<stdio.h>
int main() {
int x = 0, y = 0;
switch(x) {
x++;
y = 2;
case(0):
printf("%d\n", y--);
break;
case(1):
printf("%d\n", ++y);
break;
}
}A. 0
B. 2
C. 3
D. -1
answer: A
9.What's the output of the following program:
#include <stdio.h>
int main() {
int number = 10;
printf("%d %d %d %d\n", number, number++, number--, --number);
return 0;
}A. 10 10 11 9
B. 10 11 10 10
C. 9 8 9 9
D. 10 11 10 9
answer: C
10.What's the output of the following program:
int main() {
int a = 21, b = 11;
printf("%d\n", (--a+b, --b+a));
}A.30
B.31
C.32
D.33
answer: A
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1. What's the output of the following program:
A. 1 -1
B. 1 0
C. Dead Loop
D. 0 0
2.What's the output of the following program:
A. d1=1,a=5,b=7,c=5 d2=0,a=6,b=6,c=5 d3=0,a=7,b=5,c=5 d4=1,a=8,b=6,c=5
B. d1=1,a=5,b=7,c=5 d2=1,a=6,b=6,c=5 d3=1,a=7,b=5,c=5 d4=0,a=8,b=6,c=5
C. d1=1,a=4,b=8,c=5 d2=0,a=4,b=7,c=5 d3=1,a=4,b=7,c=5 d4=0,a=4,b=7,c=5
D. Compile error
3.What's the output of the following program:
A. 0 0
B. 0 1
C. 1 0
D. 1 1
4.What's the output of the following program:
A. 13
B. 1
C. 3
D. Compile error
5.What's the output of the following program:
A. 2.5
B. error: invalid operands to binary %
C. 0.0
D. 1.2
6.Expression
!x||a==bis Equivalent to A.!((x||a)==b)B.
!(x||y)==bC.
!(x||(a==b))D.
(!x)||(a==b)7.What's the output of the following program:
A.22
B.Compile error
C.0
D.11
8.What's the output of the following program:
A. 0
B. 2
C. 3
D. -1
9.What's the output of the following program:
A. 10 10 11 9
B. 10 11 10 10
C. 9 8 9 9
D. 10 11 10 9
10.What's the output of the following program:
A.30
B.31
C.32
D.33