blackscholes 0.24.0

Black-Scholes option pricing model calculator
Documentation 
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//! Constants
pub const N_MEAN: f32 = 0.0;
pub const N_STD_DEV: f32 = 1.0;
pub const SQRT_2PI: f32 = 2.5066282;
pub const HALF: f32 = 0.5;
pub const DAYS_PER_YEAR: f32 = 365.25;
pub use std::f32::consts::{E, PI};

pub const A: f32 = 4.62627532e-01;
pub const B: f32 = -1.16851917e-02;
pub const C: f32 = 9.63541838e-04;
pub const D: f32 = 7.53502261e-05;
pub const _E: f32 = 1.42451646e-05;
pub const F: f32 = -2.10237683e-05;