9. Bài tập trên trường-2 [26/9/2020]

[nhokhacam1]

// Rectangle.cs

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoleApp3
{
    class Rectangle
    {
        public double length;
        public double width;
        public double GetArea()
        {
            return length * width;

        }
        public void Display()
        {
            Console.WriteLine("chieu dai: {0}", length);
            Console.WriteLine("chieu rong: {0}", width);
            Console.WriteLine("Dien tich: {0}", GetArea());
        }
    }
}

[nhokhacam1]

// Program.cs

  class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Tinh dong goi trong C#");
            Console.WriteLine("-----------------------------------");
            Rectangle r = new Rectangle();
            r.length = 4.5;
            r.width = 3.5;
            r.Display();
            Console.ReadLine();

        }
    }

[nhokhacam1]

// Mảng

class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Mang trong C#");
            Console.WriteLine("------------------------");
            int[] n = new int[10];
            int i, j;
            for (i=0;i<10;i++)
            {
                n[i] = i + 100;
            }    
            for (j=0;j<10,j++)
            {
                Console.WriteLine("Phan tu [{0} = {1}", j, n[j]);
            }
            Console.ReadKey();
        }
    }

[nhokhacam1]

// mảng trong C#

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Mang trong C#");
            Console.WriteLine("------------------------");
            int[] n = new int[10];
            for (int i=0;i<10;i++)

            {
                n[i] = i + 100;
            }    
            foreach (int j in n)
            {
                int i = j - 100;
                Console.WriteLine("Phan tu [{0} = {1}", j, j);
                i++;
            }
            Console.ReadKey();
        }
    }
}

[nhokhacam1]

// Chuỗi string

 class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Cac cach tao chuoi trong C#");
            Console.WriteLine("==================================");
            //su dung phep gan hang chuoi va toan tu noi chuoi
            string fname, lname;
            fname = "Nguyen Thi Anh";
            lname = "Thu";

            string fullname = fname + " " + lname;
            Console.WriteLine("Ho va ten:{0}", fullname);

            //su dung constructor cua lop string
            char[] letters = { 'H', 'e', 'l', 'o' };
            string greetings = new string(letters);
            Console.WriteLine("\nLoi chao bang tieng Anh:  {0}", greetings);

            //tu cac phuong thuc ma tra ve mot chuoi
            string[] sarray = { "C#", "xin", "chao", "cac", "ban" };
            string message = String.Join(" ", sarray);
            Console.WriteLine("\nThong diep: {0}", message);

            //dinh dang phuong thuc de chuyen doi mot gia tri
            DateTime waiting = new DateTime(2020, 8, 1, 17, 58, 1);
            string chat = String.Format("Thong diep duoc gui luc {0;t} ngay {0;D}", waiting);
            Console.WriteLine("\nThong diep: {0}", chat);

            Console.ReadKey();
        }
    }

[nhokhacam1]

// so sanh chuổi

  static void Main(string[] args)
        {
            Console.WriteLine("So sanh chuoi trong C#");
            Console.WriteLine("------------------------------");

            string str1 = "So sanh chuoi trong C#";
            string str2 = "So sanh chuoi trong Csharp";

            if (String.Compare(str1, str2)== 0)
            {
                Console.WriteLine(str1 + " va " + str2 + " la giong nhau.");

            }   
            else
            {
                Console.WriteLine(str1 + " va " + str2 " la khong giong nhau.");
            }
            Console.ReadKey();
        }

[nhokhacam1]

// kiểm tra chuỗi con trong c#

 static void Main(string[] args)
        {
            Console.WriteLine("kiem tra chuoi con trong C#");
            Console.WriteLine("=====================================");

            string str = "chuoi con trong c#";
            if (str.Contains("trong"))
            {
                Console.WriteLine("tim thay chuoi con 'trong'.");
            }
            Console.ReadKey();
        }

[nhokhacam1]

// lấy chuỗi con trong c#

static void Main(string[] args)
        {
            Console.WriteLine("lay chuoi con trong C#");
            Console.WriteLine("=====================================");

            string str = "lay chuoi con trong c#";
            Console.WriteLine("chuoi ban dau:" + str);
            string substr = str.Substring(10);
            Console.WriteLine("chuoi con:" + substr);
            Console.ReadKey();
        }

[nhokhacam1]

// nối chuổi trong c#

 static void Main(string[] args)
        {
            Console.WriteLine("Noi chuoi trong C#");
            Console.WriteLine("=====================================");
            string[] starray = new string[] {"Hoc C# co ban va nang cao.",
            "Chuong nay trinh bay ve chuoi trong c#.",
            "chung ta dang tim hieu ve noi chuoi trong C#.",
            "Chuc cac em hoc tot." };

            string str = String.Join("\n", starray);
            Console.WriteLine(str);

            Console.ReadKey();

        }

[Duynguyen1819]

 truy cap cac phan tu trong mang
using System;

namespace ConsoleApp2
{

    class Program
    {

        static void Main(string[] args)
        {
            Console.WriteLine("mang trong C#");
            Console.WriteLine("-----------------");
            int[] n = new int[10]; /*n la mot mang gom 10 so nguyen*/
            int i, j;
            /*khoi tao ac phan tu cua mang n */
            for (i = 0; i < 10; i++)
            {
                n[i] = i + 100;
            }
            /*hien thi cac phan tu trong mang */
            for (j = 0; j < 10; j++)
            {
                Console.WriteLine("phan tu [{0}] = {1}", j, n[j]);
            }
            Console.ReadKey();
        }
    }
}

[nhokhacam1]

/// trang 68

class ThanhVienStatic
    {
        public static int num;//thanh viên static
        public void count ()

        {
            num++;

        }
        // phuong thuc static
        public static int getNum()
        {
            return num;
        }
    }
    public class TestCsharp
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Phuong thuc Static trong C#");
            Console.WriteLine("------------------------------------\n");

            //tao cac doi tuong ThanhVienStatic
            ThanhVienStatic s = new ThanhVienStatic();
            //goi phương thức
            s.count();
            s.count();
            s.count();
            Console.WriteLine("Gia tri cua num: {0}", ThanhVienStatic.getNum());

            Console.ReadKey();

        }
    }

[nhokhacam1]

slide 65

class Line
    {
        private double chieu_dai;
         public Line()//constructor
        {
            Console.WriteLine("doi tuong dang duoc tao.");

        }

        public void setChieuDai(double len)
        {
            chieu_dai = len;
        }

        public double getChieuDai()
        {
            return chieu_dai;
        }

        ~Line()//destructor
        {
            Console.WriteLine("Doi tuong dang bi xoa !!!");
        }
    }

[nhokhacam1]

slide 66

 class program1
    {
        public static void Details()
        {
            // tao doi tuong Line bang constructor
            Line line = new Line();
            // thiet lap chieu dai cho duong
            line.setChieuDai(6.0);
            Console.WriteLine("Chieu dai cua duong:{0}", line.getChieuDai());

        }

        static void Main(string[] args)
        {
            Console.WriteLine("Destructor trong C#");
            Console.WriteLine("--------------------------------");
            Details();
            GC.Collect();//don dep bo nho
            Console.ReadKey();
        }
    }

[ThanhPhong212]

slide 56

class Box
    {
        public double chieu_dai;
        public double chieu_rong;
        public double chieu_cao;
        static void Main(string[] args)
        {
            Console.WriteLine("Class trong c#");
            Console.WriteLine("---------------------------------\n");
            Box box1 = new Box();
            Box box2 = new Box();
            double thetich = 0.0;
            box1.chieu_cao = 5.0;
            box1.chieu_dai =6.0;
            box1.chieu_rong = 7.0;

            box2.chieu_cao = 5.0;
            box2.chieu_dai = 6.0;
            box2.chieu_rong = 7.0;

            thetich = box1.chieu_cao * box1.chieu_dai * box1.chieu_rong;
            Console.WriteLine("The tich cua box 1: {0}", thetich);
            thetich = box2.chieu_cao * box2.chieu_dai * box2.chieu_rong;
            Console.WriteLine("The tich cua box 2: {0}", thetich);
            Console.ReadKey();
        }
    }
}
@ThanhPhong212

ThanhPhong212 commented 2 minutes ago
slide 59

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace lop6
{
    class Box
    {
        public double chieu_dai;
        public double chieu_rong;
        public double chieu_cao;

        public void setChieudai(double len)
        {
            chieu_dai = len;
        }
        public void setChieurong(double bre)
        {
            chieu_rong = bre;
        }
        public void setChieucao(double hei)
        {
            chieu_cao= hei;
        }
        public double tinhtheTich()
        {
            return chieu_dai * chieu_rong * chieu_cao;
        }
        public static void main(string[] args)
        {
            Box box1 = new Box();
            Box box2 = new Box();
            double the_tich;
            box1.setChieurong(6.0);
            box1.setChieudai(7.0);
            box1.setChieucao(5.0);
            box2.setChieurong(12.0);
            box2.setChieudai(13.0);
            box2.setChieucao(10.0);
            the_tich = box1.tinhtheTich();
            Console.WriteLine("the tich box1: {0}", the_tich);
            the_tich = box2.tinhtheTich();
            Console.WriteLine("the tich box2: {0}", the_tich);
            Console.ReadKey();
        }
    }

[nhokhacam1]

slide 68

class ThanhVienStatic
    {
        public static int num;//thanh viên static
        public void count ()

        {
            num++;

        }
        // phuong thuc static
        public static int getNum()
        {
            return num;
        }
    }
    public class TestCsharp
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Phuong thuc Static trong C#");
            Console.WriteLine("------------------------------------\n");

            //tao cac doi tuong ThanhVienStatic
            ThanhVienStatic s = new ThanhVienStatic();
            //goi phương thức
            s.count();
            s.count();
            s.count();
            Console.WriteLine("Gia tri cua num: {0}", ThanhVienStatic.getNum());

            Console.ReadKey();

        }
    }

[Duynguyen1819]

su dung ham class
 class Program
    {

        static void Main(string[] args)
        {
            Console.WriteLine("trust trong c#");
            Console.WriteLine("----------------------)\n");
            Book Book1 = new Book(); /*khai bao book1 theo kieu book*/
            Book Book2 = new Book(); /*khai bao book2 theo kieu book*/
            /*thong tin book1*/
            Book1.nhapGiaTri("English grammer in Use", "Raymond Murphy", "tieng anh", 6495407);
            /*thong tin book2*/
            Book2.nhapGiaTri("toan cao cap", "tran van A", "toan hoc", 6495700);
            /*in thong tin book1*/
            Console.WriteLine("in thong tin cuon 1:");
            Book1.display();
            /*in thong tin book2*/
            Console.WriteLine("in thong tin cuon 2:");
            Book2.display();
            Console.ReadKey();
        }
    }
}