Exercise 2

basic.cpp

#include <cstdio>

int square(int x) {
    return x*x;
}

int main() {
    int a = 5;
    int b = 2;
    int c = a + b;
    int d = square(c);
    if (d > 2) {
        c++;
    }

    printf("%d\n", c);
}

secret

square.cpp

#include <iostream>

// your macro goes here

int main() {
    std::cout << "#1: " << SQUARE(4) << std::endl;
    std::cout << "#2: " << SQUARE(2*2) << std::endl;
    std::cout << "#3: " << SQUARE(2+2) << std::endl;

    double one_sixteenth = 1. / SQUARE(4);
    std::cout << "#4: " << 1. / one_sixteenth << std::endl;

    int a = 3;
    std::cout << "#5: " << SQUARE(++a) << std::endl;
}