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Define Macros for YES and NO constants using #define in C | C preprocessor programs

Here, we are going to learn how to define macros – In this example, we are defining two Macros YES and NO by using #define preprocessor directive.
By IncludeHelp Last updated : March 10, 2024

In this example, we have to define two macros YES with the constant value 1 and NO with the constant value 0 by using #define preprocessor directive in C programming language.

Macros definitions

#define	YES	1
#define	NO	0

Example

#include <stdio.h>

#define	YES	1
#define NO	0

//function to check and return YES or NO
//for EVEN or ODD
int checkEvenODD(int num)
{
	if( num%2 == 0 )
		return YES;
	else
		return NO;
}

//Main code
int main(){
	
	int n;
	
	n = 10;
	if( checkEvenODD(n) == YES )
		printf("%d is an EVEN number\n",n);
	else
		printf("%d is an ODD number\n",n);

	n = 11;
	if( checkEvenODD(n) == YES )
		printf("%d is an EVEN number\n",n);
	else
		printf("%d is an ODD number\n",n);	
	
	return 0;
}

Output

10 is an EVEN number
11 is an ODD number

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