Here is a very simple program that I wrote using C# programming language that will ask the user to give a positive number and then our program will check and determine if the given number by the user is a prime number or not. The code is very short and easy to understand.
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Sample Program Output
Program Listing
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace prime_number
{
class prime_number
{
static void Main(string[] args)
{
string reply;
int n = 0;
int num_value = 0;
int i=0, flag = 0;
do
{
Console.Clear();
Console.Write("Prime Number Checker ");
Console.Write("\n\n");
Console.Write("Enter a Positive Number : ");
num_value = Convert.ToInt32(Console.ReadLine());
for (i = 2; i <= num_value / 2; ++i)
{
// Condition in checking non prime numbers
if (num_value % i == 0)
{
flag = 1;
break;
}
}
if (flag == 0)
{
Console.Write("\n\n");
Console.Write("{0} is a Prime Number.", num_value);
}
else
{
Console.Write("\n\n");
Console.Write("{0} is Not a Prime Number.", num_value);
}
Console.Write("\n\n");
Console.Write("Do You Want To Continue? Y/N : ");
reply = Console.ReadLine();
if (reply == "y" || reply == "Y")
{
continue;
}
else if (reply == "n" || reply == "N")
{
Console.Write("\n\n");
Console.Write("Thank You For Using This Software.");
Console.Write("\n\n");
break;
}
} while (n == 0);
Console.ReadLine();
}
}
}
