#![allow(unused_variables)]
fn main() {
    println!("Hello {0} is {1:.5}", "x", 0.01);
    println!("Hello {1} is {2:.0$}", 5, "x", 0.01);
    println!("Hello {0} is {2:.1$}", "x", 5, 0.01);
    println!("Hello {} is {:.*}", "x", 5, 0.01);
    println!("Hello {1} is {2:.*}", 5, "x", 0.01);
    println!("Hello {} is {2:.*}", "x", 5, 0.01);
    println!("Hello {} is {number:.prec$}", "x", prec = 5, number = 0.01);
}