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How to round a floating point number to specified number of digits in Rust?

There are several ways to round floating point numbers.

1) Using println

By using println!() function with the use of {:.2} format specifier.

fn main() {
    let x = 12.7869;
    println!("{:.2}", x);



2) Using round function

By using round() function which is a built in functionality in Rust. In below example we are printing original value and new rounded value:

fn main() {
    let x = 12.7869_f64;
    let y = (x * 100.0).round() / 100.0;

    println!("{:.5} {:.5}", x, y);


12.78690 12.79000


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