Pure Programmer
Project: Floating Point Underflow
Write a program to print the positive floating point value closest to 0 that is possible to represent accurately with [[IEEE doubles]]. Also print a value slightly closer to show that it becomes 0. Does the language produce an error or simply a warning on underflow?
Output
$ rustc FloatingPointUnderflow.rs
warning: variable `smallFloat` should have a snake case name
--> FloatingPointUnderflow.rs:8:10
|
8 | let mut smallFloat:f64 = 1e-308f64;
| ^^^^^^^^^^ help: convert the identifier to snake case: `small_float`
|
= note: `#[warn(non_snake_case)]` on by default
warning: 1 warning emitted
$ ./FloatingPointUnderflow
Small float: 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
Smaller float: 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001
Smallest float: 0