Non-decimal radices/Convert: Difference between revisions

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=={{header|Rust}}==

Rust standard library provides parsing a string in a given radix to all integer types.

There is no reverse operation (except for format specifiers for binary, octal, decimal

and hexadecimal base).

<lang Rust>fn format_with_radix(mut n: u32, radix: u32) -> String {

assert!(2 <= radix && radix <= 36);

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result.chars().rev().collect()

}

fn parse_with_radix<S: AsRef<str>>(s: S, radix: u32) -> Result<u32, S> {

assert!(2 <= radix && radix <= 36);

let mut result = 0;

for digit in s.as_ref().chars().map(|it| it.to_digit(radix)) {

match digit {

Some(value) => result = result * radix + value,

None => return Err(s),

}

Ok(result)

}

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for radix in 2..=36 {

let s = format_with_radix(value, radix);

let v = ~~parse_with_radix~~(s, radix).unwrap();

let v = u32::from_str_radix(s.as_str(), radix).unwrap();

assert_eq!(value, v);

}

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println!("{}", format_with_radix(0xdeadbeef, 36));

println!("{}", format_with_radix(0xdeadbeef, 16));

println!("{}", ~~parse_with_radix~~("DeadBeef", 16)?);

println!("{}", u32::from_str_radix("DeadBeef", 16)?);

Ok(())

}</lang>