Question

For example:

long xx = ..;  //is xx in range of an int type?

I came up w/ with this question in my mind, so it’s not really an interview question, as some of you may ask.

Basically I want to write the code to check it w/o using <climits>, e.g., INT_MIN, INT_MAX. What’s the portable, most effective way to do it, if not impossible?

By portable, I mean it shouldn’t be implementation defined or platform dependent, e.g., a byte is not always 8 bits.

Answer 1

#include <limits>

long xx = 5432;

if(long(numeric_limits<int>::max()) > xx)
{
    int x = static_cast<int>(xx);
    //...