Floating-point literals that approximate constants defined in std::f32::consts or std::f64::consts should be replaced
with the predefined constants. Using the standard library constants ensures higher precision and avoids potential rounding errors that can occur when
manually approximating these values. It also improves code readability and maintainability, as it clearly indicates the intended constant value.
Noncompliant code example
let x = 3.14; // Noncompliant: Approximates PI
let y = 1_f64 / 3.1415926535; // Noncompliant: Approximates FRAC_1_PI
Compliant solution
use std::f32::consts::PI;
use std::f64::consts::FRAC_1_PI;
let x = PI; // Compliant: Uses the predefined PI constant
let y = FRAC_1_PI; // Compliant: Uses the predefined FRAC_1_PI constant
