What problems might the following macro bring to the application?

Question

Can the following macro bring problems?

#define sq(x) x*x

If yes, then how and why?please help.

Answer 1

I'm not going to give you a straight answer (this looks like a homework question), but I'm going to give you an example that will hopefully make you think about it and come up with a correct answer:

#include 

#define sq_macro(x) x * x

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

int print_and_ret(int x)
{
    std::cout << x << '\n';
    return x;
}

int main()
{
    std::cout << "Calling sq_macro:\n";
    sq_macro(print_and_ret(10));

    std::cout << "Calling sq_function:\n";
    sq_function(print_and_ret(10));
}

When you run the program, the macro and the function give two different behaviors. Think about what a macro is, and what a function is.