Write a program for printing first n prime numbers using C#

Write a program for printing first n prime numbers using C#

In this tutorial, we will discuss the concept of the Write a program for printing first n prime numbers using C#

In this post, we will learn how to write a program to print first n prime numbers using  loop in C# programming language 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 first n prime numbers

Print first n Prime numbers – method 1

In this program,  the user declares and initializes variables then it will print first n prime numbers,  using the while loop in the C# language.

Program 1

using System;
namespace primeNumber
{
    class first_N_Prime
    {
        static void Main(string[]args)
        {
        int num, count , i=3, x;
        Console.WriteLine("Enter the number of prime you want: ");
        num=Convert.ToInt32(Console.ReadLine());
        if(num>=1)
        {
            Console.WriteLine("First "+num+"prime numbers are:\n ");
            Console.WriteLine("2");
        }
        for(count=2; count<=num;){
            for(x=2; x<=i-1; x++)
            {
                if(i%x==0)
                    break;
            }
            if(x==i)
            {
                Console.WriteLine("\n "+i);
                count++;
            }
            i++;
        }
    }
}
}

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

Enter the number of primes you want:
6
The first 6prime numbers are:

2

3

5

7

11

13

Print first n Prime numbers – method 2

In this program,  the user declares and initializes variables then it will print first n prime numbers,  using the while loop in the C# language.

Program 2

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

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

first n prime number
Enter the number
5
2,3,5,7,11,

 

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