Macro dashu::dbig

macro_rules! dbig {
    ($($t:tt)+) => { ... };
}

Create an arbitrary precision float number (dashu_float::DBig) with base 10 rounding to the nearest.

let a = dbig!(12.001);
let b = dbig!(7.42e-3); // exponent in base 2 can be specified using `Bxx`

// underscores can be used to separate digits
let c = dbig!(3.141_592_653_589_793_238);

The generated float has precision determined by length of digits in the input literal.

let a = dbig!(12.001); // 5 decimal digits
assert_eq!(a.precision(), 5);

let b = dbig!(003.1200e-2); // 7 decimal digits
assert_eq!(b.precision(), 7);
assert_eq!(b.digits(), 3); // 312 only has 3 effective digits

For numbers whose significands are small enough (fit in a u32), the literal can be assigned to a constant.

use dashu_float::DBig;

const A: DBig = dbig!(-1.201);
const B: DBig = dbig!(1234_5678e-100);
const C: DBig = dbig!(-1e100000);