题目描述
Given an integer, convert it to a roman numeral.
Input is guaranteed to be within the range from 1 to 3999.
思路：
- 按面值求余。
解：
package main
import "fmt"
func intToRoman(num int) string {
//M CM D CD C XC L XL X IX V IV I
//1000 900 500 400 100 90 50 40 10 9 5 4 1
res := ""
for ; num >= 1000; {
num -= 1000
res += "M"
}
for ; num >= 900; {
num -= 900
res += "CM"
}
for ; num >= 500; {
num -= 500
res += "D"
}
for ; num >= 400; {
num -= 400
res += "CD"
}
for ; num >= 100; {
num -= 100
res += "C"
}
for ; num >= 90; {
num -= 90
res += "XC"
}
for ; num >= 50; {
num -= 50
res += "L"
}
for ; num >= 40; {
num -= 40
res += "XL"
}
for ; num >= 10; {
num -= 10
res += "X"
}
for ; num >= 9; {
num -= 9
res += "IX"
}
for ; num >= 5; {
num -= 5
res += "V"
}
for ; num >= 4; {
num -= 4
res += "IV"
}
for ; num >= 1; {
num -= 1
res += "I"
}
return res
}
func main() {
res := intToRoman(9)
fmt.Print(res)
}
