C# Program to find whether the Number is Divisible by 2

A number is divisible by 2 if the remainder is 0 when the number is divided by 2. This is checked using the modulo operator (%) in C#, which returns the remainder of a division operation.

Numbers divisible by 2 are called even numbers, while numbers not divisible by 2 are called odd numbers.

Syntax

Following is the syntax for checking divisibility by 2 using the modulo operator −

if (number % 2 == 0) {
   // number is divisible by 2 (even)
} else {
   // number is not divisible by 2 (odd)
}

Using if-else Statement

Let's check if the number 5 is divisible by 2 using an if-else statement −

using System;

class Program {
   static void Main(string[] args) {
      int num = 5;
      
      // checking if the number is divisible by 2 or not
      if (num % 2 == 0) {
         Console.WriteLine(num + " is divisible by 2");
      } else {
         Console.WriteLine(num + " is not divisible by 2");
      }
   }
}

The output of the above code is −

5 is not divisible by 2

Using Ternary Operator

We can also use the ternary operator for a more concise approach −

using System;

class Program {
   static void Main(string[] args) {
      int num = 8;
      
      string result = (num % 2 == 0) ? "divisible by 2" : "not divisible by 2";
      Console.WriteLine(num + " is " + result);
   }
}

The output of the above code is −

8 is divisible by 2

Checking Multiple Numbers

Here's an example that checks multiple numbers for divisibility by 2 −

using System;

class Program {
   static void Main(string[] args) {
      int[] numbers = {12, 7, 20, 15, 100};
      
      Console.WriteLine("Checking divisibility by 2:");
      foreach (int num in numbers) {
         if (num % 2 == 0) {
            Console.WriteLine(num + " is even (divisible by 2)");
         } else {
            Console.WriteLine(num + " is odd (not divisible by 2)");
         }
      }
   }
}

The output of the above code is −

Checking divisibility by 2:
12 is even (divisible by 2)
7 is odd (not divisible by 2)
20 is even (divisible by 2)
15 is odd (not divisible by 2)
100 is even (divisible by 2)

How It Works

The modulo operator % calculates the remainder when one number is divided by another. When we divide any number by 2:

• If the remainder is 0, the number is completely divisible by 2 (even number)

• If the remainder is 1, the number leaves a remainder when divided by 2 (odd number)

Conclusion

Checking if a number is divisible by 2 in C# is accomplished using the modulo operator %. If number % 2 == 0, the number is even and divisible by 2; otherwise, it's odd and not divisible by 2.