round a number to the nearest ten thousandth in rust

To round a number to the nearest ten-thousandth in Rust, you can use the round() function from Rust's built-in math library.

Here's an example using a float value:

main.rs
fn main() {
    let f: f64 = 1.234567891234;
    let rounded = (f * 10_000.0).round() / 10_000.0;
    println!("Rounded: {}", rounded);
}
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In the above code, we multiply the float value by 10,000 and apply the round() function to round it to the nearest integer. Then, we divide it by 10,000 to get the rounded float value that's accurate to the nearest ten-thousandth. The output of the above code will be Rounded: 1.2346.