Prime Number HarshCasper#1372 HarshCasper#1410

C-Sharp/math/Prime.cs

@@ -0,0 +1,65 @@
+//This is a problem of taking a number as a input
+//and then display the number is prime or not.
+// e.g :
+// Input : 
+// Enter a number : 13
+// Output : 
+// 13 is a Prime Number.
+using System;
+
+namespace primenumber
+{
+    class prime
+    {
+        //This function isPrime checks whether the number is prime or not.
+        //This function takes the number as a parameter.
+        //Then it checks if the number is divisible by any other number other
+        //than 1 or itself it returns a false value else a true value.
+        static bool isPrime(int number)
+        {
+            //handles the case if the entered number is equal to 1 or less than that
+            if (number <= 1)
+            {
+                return false;
+            }
+            else
+            {
+                //The iteration starts from the smallest prime number
+                for (int iteration = 2; iteration < number; iteration++)
+                {
+                    //Checks if the number is divisible by any other number other than 1 or itself
+                    if (number % iteration == 0)
+                    {
+                        return false;
+                    }
+                }
+                return true;
+            }
+        }
+        //The value from the isPrime comes to this main function and display accordingly
+        static void Main(string[] args)
+        {
+           {
+                int number;
+                bool prime;
+                Console.WriteLine( "Input :" );
+                Console.Write( "Enter a number :" + " " );
+                //Reads the input from the user
+                number = int.Parse(Console.ReadLine());
+                //The value from the isPrime either true or false is stored in the variable prime
+                prime = isPrime(number);
+                Console.WriteLine( "Output :" );
+                //True condition
+                if (prime)
+                {
+                    Console.WriteLine( number + " is prime number" );
+                }
+                //False condition
+                else
+                {
+                    Console.WriteLine( number + " is not prime number" );
+                }
+            }
+        }
+    }
+}