Macro Rules and Example

Macro without argument example

A #define directive is many a time used to define operators as shown below:

#include<stdio.h>
#define OR ||
#define AND &&
int main()
{
 int p=10,q=20,r=30;
 if((p==10) AND (q<25 OR r>=50))
    printf("You are winner!!");
 else
    printf("You are loser!!");
 getch();
 return 0;
}

The output of above program would be:

Figure: Screen shot of shows macro uses in C program

A #define directive could be used even to replace a condition as: