Created
March 9, 2018 11:08
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public class RomanNumeralsGenerator { | |
enum Numeral { | |
I(1), IV(4), V(5), IX(9), X(10), XL(40), L(50), XC(90), C(100), CD(400), D(500), CM(900), M(1000); | |
int weight; | |
Numeral(int weight) { | |
this.weight = weight; | |
} | |
}; | |
public String toRoman(long n) { | |
if( n <= 0) { | |
throw new IllegalArgumentException(); | |
} | |
StringBuilder buf = new StringBuilder(); | |
final Numeral[] values = Numeral.values(); | |
for (int i = values.length - 1; i >= 0; i--) { | |
while (n >= values[i].weight) { | |
buf.append(values[i]); | |
n -= values[i].weight; | |
} | |
} | |
return buf.toString(); | |
} | |
} |
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