Prime Number Program in C#

This is a simple C# program to check whether entered number is a prime number or not. If you are a c# beginner or want to start learning the c# programming language, then this program will help you to understand the basics of c# programming. In this program, I will explain how to write a c# program to check prime number.

Prime Number Program in C#

Copy the below c# program and execute it in your Microsoft Visual Studio IDE (Integrated Development Environment ). At the end of this program, I have shared the output of program this program.

using System;
  
  public class PrimeNumberProgram
   {  
     public static void Main(string[] args)  
      {  
          int n, i, m=0, flag=0;

          Console.Write("Enter any number to check prime number: ");

          n = int.Parse(Console.ReadLine());  
          
          m=n/2;

          for(i = 2; i <= m; i++)
          {    
           if(n % i == 0)
            {    
             Console.Write("This is not Prime Number.");    
             flag=1;    
             break;    
            }    
          }    
          if (flag==0)    
           
           Console.Write("This is a prime number.");       
     }

   }

using System;

public class PrimeNumberProgram

{

public static void Main(string[] args)

{

int n, i, m=0, flag=0;

Console.Write("Enter any number to check prime number: ");

n = int.Parse(Console.ReadLine());

m=n/2;

for(i = 2; i <= m; i++)

{

if(n % i == 0)

{

Console.Write("This is not Prime Number.");

flag=1;

break;

}

if (flag==0)

Console.Write("This is a prime number.");

}

Enter any number to check prime number: 11
This is a prime number.

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Prime Number Program in C#

Prime Number Program in C#

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