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Source code for this Tutorial

#include <stdio.h>
#include <stdlib.h>

#define ONE 1
#define AND &&
#define OR ||

#define TWO ONE+ONE
#define THREE TWO+ONE
#define MESSAGE "This is\
    a very long\
    message"

#define SQUARE(x,y) x*y

int main()
{

int result = SQUARE(10,20);
printf("result = %d\n",result);
    return 0;
}