Macro

// title: macro
// ide: apple xcode
// author: paulogp

#include <stdio.h>

// macros
#define MIN(a, b) ((a) > (b) ? (b) : (a))

#define MAX(a, b) ({\
  typeof (a) _a = (a); \
  typeof (b) _b = (b); \
  _a > _b ? _a : _b; })

#define SQ(a) (a * a)

int main (int argc, const char * argv[])
{
    // using macro
    int the_a, the_b;

    printf("a: ");
    scanf("%i", &the_a);

    printf("b: ");
    scanf("%i", &the_b);

    // outputs
    printf("min = %i\n", MIN(the_a, the_b));
    printf("max = %i\n", MAX(the_a, the_b));
    printf("%i^2 = %i\n", the_a, SQ(the_a));

    puts(__FILE__); // macro pre-definida

    return 0;
}