Function numerus::numerus_lib::roman_to_int::roman_to_int

pub fn roman_to_int(number: &str) -> Option<i32>

Convert given roman numeral into an integer. This function accepts, at the same time, both uppercase and lowercase character.

The function fails if any invalid character is meet.

An error example

    use numerus::roman_to_int;
 
    /*
        K is not a symbol in the
        roman numerical system
    */
    let wrong_roman = "XCK";
    match roman_to_int(wrong_roman) {
        Some(_) => assert!(false),
        None => assert!(true)
    }

A correct convertion

    use numerus::roman_to_int;
     
    let wrong_roman = "MCMLXIX";
    match roman_to_int(wrong_roman) {
        Some(arabic) => assert_eq!(1969, arabic),
        None => assert!(false)
    }