C# program to print 1 to n prime numbers using while loop

C# program to print 1 to n prime numbers using the while loop

In this tutorial, we will discuss the concept of the C# program to print 1 to n prime numbers using the while loop

In this post, we will learn how to print prime numbers between numbers of 1 to n using C# programming language using  while loop with Example program.

Prime number

The number that can be divided by 1 and itself. it is called a prime number

for Example 2,3,5,7,11,13…

Print prime numbers between numbers of 1 to n

Prime numbers between 1 to n using while- method 1

This program allows the user to enter a positive number for n then it will print prime numbers between numbers of 1 to n,  using while  loop in the C# language.

Program 1

using System;
namespace primeNumber
{
    class first1toNPrimewhie
    {
        static void Main(string[]args)
        {
        Console.WriteLine("print 1 to n prime number between 1 to n");
        Console.WriteLine("Enter the number");
        int num=int.Parse(Console.ReadLine());
        //reading the input
        bool isPrime=true;
        var i=2;
        while(i<=num){
var j=2;
            while(j<=num)
            {
            if(i!=j && i%j==0){
                    isPrime=false;
                break;
            }
            j++;
        }
            if(isPrime){
                Console.Write(i+",");
        }
        isPrime=true;
        i++;
    }
    Console.ReadKey();
}
}
}

When the above code is executed, it produces the following result

print 1 to n prime number between 1 to n
Enter the number
30
2,3,5,7,11,13,17,19,23,29,

 

Prime numbers between 1 to n using while- method 2

This program allows to declare variables and enter a value for num, and it will print prime numbers between numbers of 1 to n,-using while  loop in the C# language

Program 2

using System;
namespace primeNumber
{
    class first_N_Prime
    {
        static void Main(string[]args)
        {
            int i=1,num,count=0;
        Console.WriteLine("first n prime first number ");
        Console.WriteLine("Enter the number");
        num=int.Parse(Console.ReadLine());
        int n=0;
        while( n<num){
        
        count=0;
        int j=1; 
        while(j<=i){
            if(i%j==0)
                    count++;
                j++;
        }
            if(count==2){
                Console.Write(i+",");
                
        }
        i++;
        n++;
    }
}
}
}

When the above code is executed, it produces the following result

first n prime first number
Enter the number
25
2,3,5,7,11,13,17,19,23,

 

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