roman

A Rust library to convert between integers and roman numerals.

Usage

Add to Cargo.toml:

[dependencies]
roman = "0.2"

assert_eq!(roman::to(14),        Some("XIV".to_string()));
assert_eq!(roman::from("XIV"),   Some(14));
assert_eq!(roman::to(0),         None);  // out of range
assert_eq!(roman::from("XIIII"), None);  // non-canonical

assert_eq!(roman::to_lower(14),      Some("xiv".to_string()));
assert_eq!(roman::from_lower("xiv"), Some(14));

Valid range: 1 to roman::MAX (3999). Both functions return None outside that range. from rejects non-canonical forms (e.g. IIII instead of IV).