Question

Is it possible to make ostream output hexadecimal numbers with characters A-F and not a-f?

int x = 0xABC;
std::cout << std::hex << x << std::endl;

This outputs abc whereas I would prefer to see ABC.

Answer 1

Yes, you can use std::uppercase, which affects floating point and hexadecimal integer output:

std::cout << std::hex << std::uppercase << x << std::endl;

as in the following complete program:

#include <iostream>
#include <iomanip>

int main (void) {
    int x = 314159;
    std::cout << std::hex << x << " " << std::uppercase << x << std::endl;
    return 0;
}

which outputs:

4cb2f 4CB2F