Prime Number:-Prime number is number that is greater than 1,Prime Number is divisible by 1 or number itself,Prime number has only two factor 1 or number itself.for example 2,3,5,7,11,13 and 17 are prime numbers. number.2 is smallest prime number. 2 is only even prime number.
Algorithm:-
(1)Take number n from user and variable a with initial value zero
(2)divide these number from 1 to n
(3)if number n is divisible only by 1 and n then increment value of variable 2 times
(4)if increment value of a will equal to 2 then number is prime number else number is not prime number.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TestApplicationOnly
{
class Program
{
static void Main(string[] args)
{
try
{
int n, a = 0;
Console.Write("Enter the number :");
n = Convert.ToInt32(Console.ReadLine());
for (int i = 1; i <= n; i++)
{
if (n % i == 0)
{
a++;
}
}
if (a == 2)
{
Console.WriteLine(n+" is a Prime Number");
}
else
{
Console.WriteLine(n+" is not a Prime Number");
}
}
catch (Exception ex)
{
Console.WriteLine("Input is not in correct formate");
}
Console.ReadKey();
}
}
}
Output:-
Enter the number :5
5 is a Prime Number
Enter the number :6
6 is not a Prime Number
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