Program to print prime numbers from 1 to n using C#
In this tutorial, we will discuss the concept of the Program to print prime numbers between numbers of 1 to n using C#
In this post, we will learn how to print prime numbers between numbers of 1 to n using 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 prime numbers between numbers 1 to n
Prime numbers between 1 to n – 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 the C# language.
Program 1
using System;
namespace primeNumber
{
class first_N_Prime
{
static void Main(string[]args)
{
bool isPrime=true;
Console.WriteLine("Enter the number of prime you want: ");
int num=Convert.ToInt32(Console.ReadLine());
for(int i=2; i<=num; i++){
for(int j=2; j<=num; j++)
{
if(i!=j && i%j==0){
isPrime=false;
break;
}
}
if(isPrime)
{
Console.Write("\n "+i);
}
isPrime=true;
}
Console.ReadKey();
}
}
}
When the above code is executed, it produces the following result
Enter the number of primes you want:
8
2
3
5
7
Prime numbers between 1 to n – 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 first_N_Prime
{
static void Main(string[]args)
{
int i,j,num,flag;
Console.WriteLine("first n prime number between 1 to n");
num=int.Parse(Console.ReadLine());
for(i=2; i<=num; i++){
flag=1;
for(j=2; j<=i/2; j++)
{
if(i%j==0){
flag=0;
break;
}
}
if(flag==1)
Console.Write(i+",");
}
Console.ReadKey();
}
}
}
When the above code is executed, it produces the following result
first n prime number between 1 to n
20
2,3,5,7,11,13,17,19,
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