C Program to check number is prime or composite

C# Program to check entered number is prime or composite 

Program Statement:

Write a program that takes an integer as an input from user and prints if it is a prime or composite number.

Solution:

 static void Main(string[] args)
 {
 int num, i;
 Console.WriteLine("Enter the number to check number is prime or composite");
 num=Convert.ToInt32(Console.ReadLine());
 i = 2;
 while (i <= num - 1)
 {
 if (num % i == 0)
 {
 Console.WriteLine("composite number: "+num);
 break;
 }
 i++;
 }
 if (i == num)
 Console.WriteLine("prime number: " + num);
 Console.ReadLine(); 
 
 }