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

// PREPROCESSOR MACROS  (aka #define MACROS)
//
// RULES
// 1. Parenthesize every argument.
// 2. Parenthesize entire expression.
// 3. No semicolon at the end
// 4. One line (for now)

#define triple(n) ((n) * 3)  // CORRECT

#define add_5(n)  ((n) + 5)  // CORRECT


int main(int argc, char* argv[]) {
    int a = 5;
    int b = triple(5);  // becomes a * 3

    printf("triple(%d) == %d\n", a, b);

    int c = triple(5 + 2);   // become (5 + 2) * 3
    //                                 └──┬──┘
    //                                parameter
    // should be: 21
    // actually:  21
    printf("triple(%d + 2) == %d\n", a, c);

    int d = add_5(5);
    printf("add_5(%d) == %d\n", a, d);

    int e = add_5(5) * 100;   // becomes 5 + 5 * 100
    //                                   └─┬─┘
    //                             result of add_5(5)
    // Expect:  e == 1000 
    // Actual:  e == 505    ...  WRONG!!!!
    printf("add_5(%d) * 100 == %d\n", a, e);

    return EXIT_SUCCESS;
}
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