C program to check number is even or odd

C program to check given number is even or odd 

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

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

Before writing any program you just imagine about output screen first. Like what input to be given, and output to be displayed. Let's have a look at the below example.

1. INPUT
2. 
   
3. Enter any number to check even or odd: 15
4. 
   

  OUTPUT

15 is odd number.

Required knowledge for this exercise

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

Logic to check whther number is even or odd using if...else:

Remember: If any number is exactly divisible by 2then it is called even number otherwise odd. 

1) Input any number from user and store it in variable num using scanf()

2) Check the given number is exactly divisible by 2or not using modulo % operator. Likeif(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 chek whether a number is even or odd using if...else: 

1. /* C program to whether number is even or odd */ #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; }

Please note: if(num % 2 == 0) Here, symbol%is a modulo operator not a percent sign. 

Output:

1. Enter any number to check even or odd: 15
2. 30 is odd number.

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