In this article we
will discuss with you the program for checking whether given no. is prime or
not using console application in c#.net:
Step1: Take a new console application using c# as
a language in the Visual studio.
Step2: Read an input from the User in this
Variable “int_Number” for storing that number which you want to test for prime number.
Step3: Now if that input
number is 1 or 2 then it will be a prime number otherwise we have to loop from
2 till that number and Start dividing that input number from 2 till that number,
If it’s divisible by any of the number before the “input number-1” then it
means that it’s not a prime number otherwise it is a prime number.
using System;
using
System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PrimeNo
{
class Program
{
static void Main()
{
int int_Number;
int
i;
Console.WriteLine("Enter a number to check whether it is prime or
not?");
int_Number = int.Parse(Console.ReadLine());
if
((int_Number == 2) || (int_Number == 1))
{
Console.WriteLine("The Given number is prime number");
Console.ReadLine();
}
else
{
for
(i = 2; i < int_Number; i++)
{
if
(int_Number % i == 0)
{
Console.WriteLine("The Given number
is not prime number");
Console.ReadLine();
break;
}
}
if
(int_Number == i)
{
Console.WriteLine("The Given number is prime number");
Console.ReadLine();
}
}
}
}
}
Output:-
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