C Program to check even or odd number

C Program to check whether a number is even or odd 

By Ahmad Irshad | C Programming Exercises and Solutions > If...Else  

Write a C program to input a number from user and check whether a given number is even or odd using if...else. Let's see the below step by step logic check even or odd number.

Example:

1. INPUT
2. Enter any number to check even or odd: 15
3. 
   

  OUTPUT

15 is a odd number.

Required knowledge for this exercise

Input / output | Variables | Data types | If-else | Relational operator | Logical operator | Arithmetic operator

Logic to check whether a given number is even or odd:

Even or odd: If any number which is exactly divisible by 2 with zero remainder then number is even otherwise odd. 

We can use modulo operator % to check whether a number is exactly divisible by 2 or not. 

For example: if(num % 2 == 0) i.e if the number modulo division 2 is true then the number is even otherwise odd.

Now let's see the below step by step logic to check divisibility of a number.

1) Input a number from user and store it in variable num using scanf() function.

2) Check the given number is exactly divisible by 2or not using modulo % operator.

Like if(num % 2 == 0) if it's remainder is equal to0then number is even otherwise odd. Since we know that, modulo %operator always returns remainder.

Program to check whether a number is even or odd using if...else: 

1. /* C program to check whether a number is odd or even */ #include <stdio.h> int main() { int num; /* Input number from user */ printf("Enter any number to check even or odd: "); scanf("%d", &num); /* Check if the number is divisible by 2 then it is even */ if(num % 2 == 0) { /* If it's remainder is zero then */ printf("%d is Even number.", num); } else { /* If it's remainder is Nonezero then */ printf("%d is Odd number.", num); } return 0; }

Note: As you can see in above program if and else body contains only single statement. Hence, you can ignore braces { } after if and  else statement. 

For Example:

if(num % 2 == 0)
/* num % 2 is 0 */
printf("%d Number is Even.", num);
else
/* num % 2 is 1 */
printf("%d Number is Odd.", num);

Output:

 Enter any number to check is even or odd: 16
 16 is even number.

 Enter any number to check is even or odd: 11
 11 is odd number.

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