Macro Definition and Expansion using #define in C Pre Processor
Source code for this Tutorial
#include <stdio.h>
#include <stdlib.h>
#define LIMIT 5
#define PI 3.1452
#define PASSWORD "32klj54op"
#define DISPLAY printf("Hello world");
int main()
{
int counter;
for(counter = 1; counter <= LIMIT; counter++)
printf("%d\n",counter);
printf("PI = %f\n",PI);
printf("%s\n",PASSWORD);
DISPLAY
return 0;
}