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

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

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

In this post, we are going to learn how to write a program to find first n prime numbers and display the result on the screen in C# programming language.

Code to print first n prime number

Print the prime number in C# -using for loop

In this program, the user initiates the values to variables and the program asked to enter value for num, then it will print first n prime nunbers using for loop in the C# programming language.

Program 1

//Write a program for printing first n prime numbers in C#
// using for loop
using System;
namespace primeNumber
{
  class first_N_Prime
  {
      static void Main(string[]args)
      {
      int i=1,j=1,num,count=0;
      //variable decaration 
    Console.WriteLine("first n prime number ");
    Console.WriteLine("Enter the number");
    num=int.Parse(Console.ReadLine());
    //\reading the input
    for(int n=0; n<num;  i++){//outer for loop
    
    count=0;
    for(j=1;j<=i; j++){//inner for loop
      if(i%j==0)
          count++;
          
    }
      if(count==2){
        Console.Write(i+",");
        n++;
    }
  
  }
}
}
}

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

first n prime number
Enter the number
15
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,

 

 

Print the prime number in C# -using while loop

In this program, the user initiates the values to variables and the program asked to enter value for num, then it will print first n prime nunbers  using while loop in the C# programming language.

Program 2

// Write a program for printing first n prime numbers in C#
// using while loop

using System;
namespace primeNumber
{
  class first_N_Prime
  {
      static void Main(string[]args)
      {
      int i=1,j=1,num,count=0;
      //variable decaration 
    
    Console.WriteLine("Enter the number");//ask input rom the user
    num=int.Parse(Console.ReadLine());
    //reading the input
    Console.WriteLine("print first "+ num+ " prime number \n");
    int n=0; 
    while(n<num){
    //outer while loop
    count=0;
    j=1;
    while(j<=i){//inner while loop
      if(i%j==0)
          count++;
           j++;
    }
      if(count==2){
        Console.Write(i+",");
        //print prime numbers
        n++;
    }
    i++;
  }
}
}
}

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

Enter the number
12
print first 12 prime number

2,3,5,7,11,13,17,19,23,29,31,37,

 

Print the prime number in C# -using do-while loop

In this program, the user declare and initiates the values to variables and the program asked to enter value for num, then it will print first n prime nunbers using do-while loop in the C# programming language.

Program 3

// Write a program for printing first n prime numbers in C#
// using do-while loop

using System;
namespace primeNumber
{
  class first_N_Prime
  {
      static void Main(string[]args)
      {
      int i=1,j=1,num,count=0;
      //variable decaration 
    
    Console.WriteLine("Enter the number");//ask input rom the user
    num=int.Parse(Console.ReadLine());
    //reading the input
    Console.WriteLine("print first "+ num+ " prime number \n");
    int n=0; 
    do{
    //outer do-while loop
    count=0;
    j=1;
    do{//inner do-while loop
      if(i%j==0)
          count++;
           j++;
    }while(j<=i);
      if(count==2){
        Console.Write(i+",");
        //print prime numbers
        n++;
    }
    i++;
  }while(n<num);
}
}
}

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

Enter the number
8
print first 8 prime number

2,3,5,7,11,13,17,19,

 

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