how to check return values on fnctions c++ code example

Example 1: c++ check function return value

#pragma GCC diagnostic error "-Wreturn-type"

Example 2: return function in cpp

// Single return at end often improves readability.
int max(int a, int b) {
    int maxval;
    if (a > b) {
        maxval = a;
    } else {
        maxval = b;
    }
    return maxval;
}//end max