Question

How to declare a real variable with at least 20 digits in Rust

Answer 1

fn main() {
    // Start with a string to preserve input precision
    let input = "3.141592653589793238462643";
    
    // Parse to f64 – keep in mind this loses precision beyond ~15 digits
    let x: f64 = input.parse().unwrap();

    println!("Approximate value: {:.21}", x);
}


/*
run:

3.141592653589793238462643

*/

 

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