40 lines
1.1 KiB
Rust
40 lines
1.1 KiB
Rust
struct RomanNumeral {
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symbol: &'static str,
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value: u32
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}
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const NUMERALS: [RomanNumeral; 13] = [
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RomanNumeral {symbol: "M", value: 1000},
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RomanNumeral {symbol: "CM", value: 900},
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RomanNumeral {symbol: "D", value: 500},
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RomanNumeral {symbol: "CD", value: 400},
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RomanNumeral {symbol: "C", value: 100},
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RomanNumeral {symbol: "XC", value: 90},
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RomanNumeral {symbol: "L", value: 50},
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RomanNumeral {symbol: "XL", value: 40},
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RomanNumeral {symbol: "X", value: 10},
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RomanNumeral {symbol: "IX", value: 9},
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RomanNumeral {symbol: "V", value: 5},
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RomanNumeral {symbol: "IV", value: 4},
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RomanNumeral {symbol: "I", value: 1}
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];
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fn to_roman(mut number: u32) -> String {
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let mut min_numeral = String::new();
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for numeral in NUMERALS.iter() {
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while numeral.value <= number {
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min_numeral = min_numeral + numeral.symbol;
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number -= numeral.value;
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}
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}
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min_numeral
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}
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fn main() {
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let nums = [2014, 1999, 25, 1666, 3888];
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for &n in nums.iter() {
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// 4 is minimum printing width, for alignment
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println!("{:2$} = {}", n, to_roman(n), 4);
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}
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}
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