#include<stdio.h>

// NOT a good use of #define !
#define float int

// A more normal use
#define PI 3.141592653

// A pretty good use of a macro
#define SQUARE(X) (X*X)

int main(){
	float x = 5.5;

	printf("%f\n", x);

	printf("pi is %f\n", PI);

	printf("pi squared is %f\n", SQUARE(PI));
	printf("5 squared is %d\n", SQUARE(5));

	return 0;
}