// Copyright 2014-2016 The Rust Project Developers. See the COPYRIGHT // file at the top-level directory of this distribution and at // http://rust-lang.org/COPYRIGHT. // // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your // option. This file may not be copied, modified, or distributed // except according to those terms.
//! A collection of numeric types and traits for Rust. //! //! This includes new types for big integers, rationals, and complex numbers, //! new traits for generic programming on numeric properties like `Integer`, //! and generic range iterators. //! //! ## Example //! //! This example uses the BigRational type and [Newton's method][newt] to //! approximate a square root to arbitrary precision: //! //! ``` //! # #[cfg(any(feature = "alloc", feature = "std"))] //! # mod test { //! //! use num::FromPrimitive; //! use num::bigint::BigInt; //! use num::rational::{Ratio, BigRational}; //! //! # pub //! fn approx_sqrt(number: u64, iterations: usize) -> BigRational { //! let start: Ratio<BigInt> = Ratio::from_integer(FromPrimitive::from_u64(number).unwrap()); //! let mut approx = start.clone(); //! //! for _ in 0..iterations { //! approx = (&approx + (&start / &approx)) / //! Ratio::from_integer(FromPrimitive::from_u64(2).unwrap()); //! } //! //! approx //! } //! # } //! # #[cfg(not(any(feature = "alloc", feature = "std")))] //! # mod test { pub fn approx_sqrt(n: u64, _: usize) -> u64 { n } } //! # use crate::test::approx_sqrt; //! //! fn main() { //! println!("{}", approx_sqrt(10, 4)); // prints 4057691201/1283082416 //! } //! //! ``` //! //! [newt]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method //! //! ## Compatibility //! //! The `num` crate is tested for rustc 1.60 and greater.
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