Formatting Macros

format!, write!, print! และ macros อื่นๆ

format! Macro

fn main() {
    // Basic formatting
    let s = format!("Hello, {}!", "world");
    println!("{}", s);

    // Multiple arguments
    let s = format!("{} + {} = {}", 1, 2, 3);
    println!("{}", s);

    // Positional arguments
    let s = format!("{0} {1} {0}", "ping", "pong");
    println!("{}", s);

    // Named arguments
    let s = format!("{name} is {age} years old", name = "Alice", age = 30);
    println!("{}", s);

    // Mixed
    let s = format!("{} {} {x}", 1, 2, x = 3);
    println!("{}", s);

    // From variables
    let name = "Bob";
    let age = 25;
    let s = format!("{name} is {age}");  // Capture from scope
    println!("{}", s);

    // Escaping braces
    let s = format!("{{}} = braces, {} = value", 42);
    println!("{}", s);
}