C# Programming Example

Qu 1:Write a program to show difference between value type parameter and reference type parameter.

Example:

---

using System;

namespace Example1
{
  class Program
   {
     public static void value(int num)
      {
        num++;
      }
     public static void reference(ref int num)
      {
        num++;
      }

     static void Main(string[] args)
      {
        int num;
        Console.Write("Enter a number:\t");
        num = Convert.ToInt32(Console.ReadLine());
        Console.WriteLine("\n\n\tValue Type");
        Console.WriteLine("----------------");
        Console.Write("\nPrevious Value:\t{0}", num);
        Program.value(num);
        Console.Write("\nCurrent Value:\t{0}", num);
           
        Console.WriteLine("\n\n\n----------------");
        Console.WriteLine("\tReference Type");
        Console.WriteLine("--------------------");
        Console.Write("\nPrevious Value:\t{0}", num);
        Program.reference(ref num);
        Console.Write("\nCurrent Value:\t{0}", num);
        Console.ReadLine();
      }
   }
}

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Output
Enter a number: 9


     Value Type
---------------------------------

Previous Value: 9
Current Value: 9

---------------------------------
     Reference Type
---------------------------------

Previous Value: 9
Current Value: 10

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Qu2:Write a program in which accept two argument as parameter from the user and returns four output value as add, subtract, multiplication and division.

Example:

---

using System;

namespace Example2
{
  class Program
   {
     public static void parameter(int num1, int num2,            out int add, out int sub, out int mul, out float div)
      {
        add = num1 + num2;
        sub = num1 - num2;
        mul = num1 * num2;
        div = (float)num1 / num2;
      }
     static void Main(string[] args)
      {
        int num1,num2;
        int add, sub, mul;
        float div;
        Console.Write("Enter 1st number\t");
        num1 = Convert.ToInt32(Console.ReadLine());
        Console.Write("\nEnter 2nd number\t");
        num2 = Convert.ToInt32(Console.ReadLine());

        Program.parameter(num1, num2, out add, out sub,              out mul, out div);
        Console.WriteLine("\n\n{0} + {1} = {2}", num1,              num2, add);
        Console.WriteLine("{0} - {1} = {2}", num1, num2,            sub);
        Console.WriteLine("{0} * {1} = {2}", num1, num2,            mul);
        Console.WriteLine("{0} / {1} = {2}", num1, num2,            div);

        Console.ReadLine();
      }
   }
}

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Output

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Enter 1st number       7

Enter 2nd number       9


7 +9 = 16
7 - 9 = -2
7 * 9 = 63
7 / 9 = 0.7777778

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 Qu3:Write a program in which pass two number as command line argument and displays the multiplication of both number.

Example:

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a.Write the following command on notepad and save as commandline.cs

using System;

namespace Example3
{
  class Program
   {
     static void Main(string[] args)
      {
        int num1,num2,result;
        num1 = Convert.ToInt32(args[0]);
        num2 = Convert.ToInt32(args[1]);
        result = num1 * num2;
        Console.WriteLine("{0} x {1} = {2}", num1, num2,            result);
      }
   }
}

b.Open visual studio command prompt and set current path of your program.
c.Compile it as csc commandline.cs
d.Now execute program as commandline 5 4

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Output

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commandline 5 4
5 x 4 = 20