Lib.rs

BIG NUM MATH

Library for computations on large numbers.

• underdeveloped:
  1. no plan for new functions (goniometric, radix, …)
  2. upcoming optimizations (memory consumption, speed up on some computations, ergonomy, …)
  3. divrem can perform unbearably when divisor is significantly smaller than dividend (as per point 2)
• primitive simple functions only:
  • addition +substraction,
  • multiplication +division
  • relation operators
  • power

Usage Samples

power

let row = PlacesRow::new_from_num(u128::MAX);
let pow = pow(&row, 500);
let number = pow.to_number();

assert!(number.starts_with("8312324609993336522"));
assert_eq!(19266, number.len());

division with remainder

let dividend = PlacesRow::new_from_str("3402823669209384634633746074317682114565556668744123").unwrap();
let divisor  = PlacesRow::new_from_str(  "14034568236692093846346337460345176821145655563453").unwrap();
let ratio = "242";        
let remainder = "6458155929897923817932408914149323848308022388497";
        
let ratrem = divrem(&dividend, &divisor).unwrap();
        
assert_eq!(ratio, ratrem.0.to_number());
assert_eq!(remainder, ratrem.1.to_number());

decimal places relation

let number    = Row::new_from_str("1489754132134687989463132131").unwrap();
let comparand = Row::new_from_str(        "48645698946456531371").unwrap();
let decrel = rel_dec(&number, &comparand);

assert_eq!(RelDec::Greater((28, 20, 8)), decrel);