The following code example is taken from the book
C++23 - The Complete Guide
by Nicolai M. Josuttis,
Leanpub, 2026
The code is licensed under a
Creative Commons Attribution 4.0 International License.
// raw code
// - compile with VC++:
// cl /O2 /std:c++latest /EHsc /utf-8 utf8.cpp
#include <iostream>
#include <format>
#include <print>
int main()
{
// use "Köln 100€" as UTF-8 string literal with Unicode:
constexpr const char* data = "K\u00F6ln 100\u20AC";
// print the value of each character:
std::println("hex dec char");
std::println("--------------");
for (auto p = data; *p != '\0'; ++p) {
std::println(" {0:2X} {0:3d} '{0}'", *p);
}
std::println("");
std::cout << "** << and format():\n";
std::cout << data << '\n'; // might print garbage (on Windows)
std::cout << std::format("{}\n", data); // might print garbage (on Windows)
std::cout << "** print() and println():\n";
std::print("{}\n", data); // prints "Köln 100€"
std::println(data); // prints "Köln 100€"
}