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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);
}

Output

12.79


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);
}

Output

12.78690 12.79000

Conclusion

In this page (written and validated by ) you learned about How to round a floating point number to specified number of digits in Rust? . What's Next? If you are interested in completing Rust tutorial, we encourage you simply to start here: Rust Tutorial.



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