How do I print a Rust floating-point number with all available precision?

Question

I am implementing the CORDIC algorithm for the sin trigonometric function. In order to do this, I need to hardcode/calculate a bunch of arctangent values. Right

Answer 1

This answer was written for Rust 0.12.0 and doesn't apply to Rust 1.x.

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You can use std::f32::to_string to print all the digits.

use std::f32;

fn main() {
    let pi: f32 = 3.1415926536897932384626;
    let k1: f32 = 0.6072529350088812561694; // 1/k

    println!("pi is {}", f32::to_string(pi));
    println!("k1 is {}", f32::to_string(k1));
}

Output:

pi is 3.1415927410125732421875
k1 is 0.607252979278564453125