lst-0019-book.cpp
// https://godbolt.org/z/csbPMYM19
#include <iostream>
#include <ios> // hex, dec
using std::cout; using std::endl;
int main() {
int val = 255;
cout << std::showbase << std::hex << val << endl; // Output: 0xff
cout << std::noshowbase << std::dec << val << endl; // Output: 255
}