Function rustc_unicode::char::from_digit
[−]
[src]
pub fn from_digit(num: u32, radix: u32) -> Option<char>
Converts a digit in the given radix to a char
.
A 'radix' here is sometimes also called a 'base'. A radix of two indicates a binary number, a radix of ten, decimal, and a radix of sixteen, hexadecimal, to give some common values. Arbitrary radicum are supported.
from_digit()
will return None
if the input is not a digit in
the given radix.
Panics
Panics if given a radix larger than 36.
Examples
Basic usage:
fn main() { use std::char; let c = char::from_digit(4, 10); assert_eq!(Some('4'), c); // Decimal 11 is a single digit in base 16 let c = char::from_digit(11, 16); assert_eq!(Some('b'), c); }use std::char; let c = char::from_digit(4, 10); assert_eq!(Some('4'), c); // Decimal 11 is a single digit in base 16 let c = char::from_digit(11, 16); assert_eq!(Some('b'), c);
Returning None
when the input is not a digit:
use std::char; let c = char::from_digit(20, 10); assert_eq!(None, c);
Passing a large radix, causing a panic:
fn main() { use std::thread; use std::char; let result = thread::spawn(|| { // this panics let c = char::from_digit(1, 37); }).join(); assert!(result.is_err()); }use std::thread; use std::char; let result = thread::spawn(|| { // this panics let c = char::from_digit(1, 37); }).join(); assert!(result.is_err());