from_digit in core::char - Rust
Description: Converts a digit in the given radix to a `char`.
Keywords: rust, rustlang, rust-lang, from_digit

# Function core::char::from_digit
1.0.0[−][src]

    pub fn from_digit(num: u32, radix: u32) -> Option<char>

Expand description

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 radices 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:

    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);

Run

Returning `None` when the input is not a digit:

    use std::char;

    let c = char::from_digit(20, 10);

    assert_eq!(None, c);

Run

Passing a large radix, causing a panic:

ⓘ

    use std::char;

    // this panics
    let c = char::from_digit(1, 37);

Run