C Program to Check if a Number is Even or Odd

An even number is a number that is completely divisible by 2. An odd number is a number that is not completely divisible by 2. If you divide an odd number then the remainder will always 1.

Example:

Odd numbers : 1,3,5,7,9,11,13,15,17,19
Even numbers: 0,2,4,6,8,10,12,14,16,18,20

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Pre-requisite Programming concepts

• Input output operations in C, C++ and Java.
• % opeartor ( it performs division operation and assigns the remainder )
• Data-type in c, c++ and java.

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Logic for Checking a Number is Odd or Even

• Input the number.
• Divide the number by 2 if the remainder is equal to 0 then it is an even number otherwise
  that number is odd.

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C Program to Check Even or Odd Number

#include<stdio.h>
int main(int argc, char const *argv[])
{
	//scan a number to check even or odd
	int number;
	printf("\nOdd or even program in c\n");
	scanf("%d",&number);
	/*If the number is competely divisible by 2.
	then that number is even number.
	otherwise that number is odd number.
	*/
	if( number % 2 == 0 )
	{
		printf("%d is even number\n",number);
	}
	else
	{
		printf("%d is odd number\n",number);
	}
	return 0;
}

Output

Code Explanation

First print get the number from the user using scanf() function. Using % check for the remainder that is 1 or 0. If the remainder is zero then print the number is even or print the number is odd number using printf() function.

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