Program for printing first n prime numbers using for loop in C#

Program for printing first n prime numbers using for loop in C#

In this tutorial, we will discuss the concept of the Program for printing first n prime numbers using for loop in C#

In this post, we will learn how to print first n prime numbers using a for 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 using for

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 for loop in the C# language.

Program 1

using System;
namespace primeNumber
{
    class first_N_Prime
    {
        static void Main(string[]args)
        {
        int num=12, count , i=3, x;
        
        if(num>=1)
        {
            Console.WriteLine("First "+num+" prime numbers are:\n ");
            Console.Write("2 ");
        }
        for(count=2; count<=num;){
            for(x=2; x<=i-1; x++)
            {
                if(i%x==0)
                    break;
            }
            if(x==i)
            {
                Console.Write(i+" ");
                count++;
            }
            i++;
        }
    }
}
}

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

First 12 prime numbers are:
2 3 5 7 11 13 17 19 23 29 31 37

 

Print first n Prime numbers – method 2

In this program, the user is asked to enter the value for n.,  then it will print first n prime numbers,  using the for loop in the C# language.

Program 2

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.Write("2 ");
        }
        for(count=2; count<=num;){
            for(x=2; x<=i-1; x++)
            {
                if(i%x==0)
                    break;
            }
            if(x==i)
            {
                Console.Write(i+" ");
                count++;
            }
            i++;
        }
    }
}
}

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

Enter the number of prime you want:
10
First 10 prime numbers are:

2 3 5 7 11 13 17 19 23 29

 

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