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main.rs
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main.rs
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use std::time::{Instant};
fn separate_parts(value: f64) -> (i64, f64) {
let whole_part = value as i64;
let fractional_part = value - whole_part as f64;
(whole_part, fractional_part)
}
fn approximate_float(input_value: f64, accuracy_score: f64) -> (i64, i64, i64) {
let (whole_part, fractional_part) = separate_parts(input_value);
let mut denominator = 1;
let mut numerator = (fractional_part * denominator as f64).round() as i64;
println!("Starting approximation");
// Main approximation loop
while (fractional_part - (numerator as f64 / denominator as f64)).abs() > accuracy_score {
denominator += 1;
numerator = (fractional_part * denominator as f64).round() as i64;
}
(whole_part, numerator, denominator)
}
fn main() {
let start = Instant::now(); // Start timer
println!("Timer started");
let input_value = 3.14159265358979323846264338327950288419716939937510;
let accuracy_score = 0.0000000000001;
let (whole_part, numerator, denominator) = approximate_float(input_value, accuracy_score);
let result = whole_part as f64 + numerator as f64 / denominator as f64;
let mut percentage_accuracy = (input_value / result) * 100.0;
if percentage_accuracy > 100.0 {
percentage_accuracy = (result / input_value) * 100.0;
}
let duration = start.elapsed(); // stop timer
println!("Timer stopped");
println!(
"{} approximates to {} + {}/{}, which equals {}. This approximation is {}% accurate.",
input_value,
whole_part,
numerator,
denominator,
result,
percentage_accuracy
);
println!("Time elapsed is: {:?}", duration);
}