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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