Program for printing 1 to n prime numbers using for loop in C#

Program for printing 1 to n prime numbers using for loop in C#

In this tutorial, we will discuss the concept of the Program for printing 1 to n prime numbers using for loop in C#

In this post, we will learn how to print prime numbers between numbers of 1 to n using C# programming language using  for 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 1 to n

Prime numbers between 1 to n using for- 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 for loop in the C# language.

Program 1

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

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

first, n prime first number
Enter the number
18
2,3,5,7,11,13,17,

 

Prime numbers between 1 to n using for- method 2

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 the C# language.

Program 2

using System;
namespace primeNumber
{
    class first1toNPrime
    {
        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;
        for(var i=2; i<=num; i++){
            
            for(var j=2; j<=num; j++)
            {
            if(i!=j && i%j==0){
                    isPrime=false;
                break;
            }
        }
            if(isPrime){
                Console.Write(i+",");
        }
        isPrime=true;
        
    }
    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
20
2,3,5,7,11,13,17,19,

 

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