C# program to print 1 to n prime numbers using while loop
C# program to print 1 to n prime numbers using the while loop
In this tutorial, we will discuss the concept of the C# program to print 1 to n prime numbers using the while loop
In this post, we will learn how to print prime numbers between numbers of 1 to n using C# programming language using while 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 of 1 to n
Prime numbers between 1 to n using while- 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 while loop in the C# language.
Program 1
using System;
namespace primeNumber
{
class first1toNPrimewhie
{
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;
var i=2;
while(i<=num){
var j=2;
while(j<=num)
{
if(i!=j && i%j==0){
isPrime=false;
break;
}
j++;
}
if(isPrime){
Console.Write(i+",");
}
isPrime=true;
i++;
}
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 30 2,3,5,7,11,13,17,19,23,29,
Prime numbers between 1 to n using while- method 2
This program allows to declare variables and enter a value for num, and it will print prime numbers between numbers of 1 to n,-using while loop in the C# language
Program 2
using System;
namespace primeNumber
{
class first_N_Prime
{
static void Main(string[]args)
{
int i=1,num,count=0;
Console.WriteLine("first n prime first number ");
Console.WriteLine("Enter the number");
num=int.Parse(Console.ReadLine());
int n=0;
while( n<num){
count=0;
int j=1;
while(j<=i){
if(i%j==0)
count++;
j++;
}
if(count==2){
Console.Write(i+",");
}
i++;
n++;
}
}
}
}
When the above code is executed, it produces the following result
first n prime first number Enter the number 25 2,3,5,7,11,13,17,19,23,
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