std::format Basics

#include <format>
#include <iostream>
#include <string>
int main() {
    // Basic formatting
    std::string greeting = std::format("Hello, {}!", "World");
    std::cout << greeting << std::endl;  // Hello, World!
    
    // Multiple arguments
    std::string info = std::format("{} is {} years old", "Alice", 30);
    std::cout << info << std::endl;  // Alice is 30 years old
    
    // Positional arguments
    std::string reordered = std::format("{1} comes before {0}", "B", "A");
    std::cout << reordered << std::endl;  // A comes before B
    
    // Numeric formatting
    double pi = 3.14159265359;
    std::cout << std::format("Pi: {:.2f}", pi) << std::endl;  // Pi: 3.14
    std::cout << std::format("Pi: {:10.4f}", pi) << std::endl; // Pi:     3.1416
    
    // Integer formatting
    int num = 255;
    std::cout << std::format("Decimal: {}", num) << std::endl;    // 255
    std::cout << std::format("Hex: {:x}", num) << std::endl;      // ff
    std::cout << std::format("Hex: {:#x}", num) << std::endl;     // 0xff
    std::cout << std::format("Binary: {:b}", num) << std::endl;   // 11111111
    
    return 0;
}