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roman: check number range

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This commit is contained in:
vinchent 2024-09-22 22:00:50 +02:00
parent abc546178d
commit 8629b537b0
2 changed files with 15 additions and 6 deletions
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15
roman/roman.go
View File

@ -1,6 +1,9 @@
package roman
import "strings"
import (
"errors"
"strings"
)
type RomanNumeral struct {
Value uint16
@ -24,7 +27,12 @@ var allRomanNumerals = []RomanNumeral{
{1, "I"},
}
func ConvertToRoman(arabic uint16) string {
var ErrNumberOutOfRange = errors.New("numbers should not be bigger than 3999")
func ConvertToRoman(arabic uint16) (string, error) {
if arabic > 3999 {
return "", ErrNumberOutOfRange
}
var converted strings.Builder
for _, numeral := range allRomanNumerals {
for arabic >= numeral.Value {
@ -33,9 +41,10 @@ func ConvertToRoman(arabic uint16) string {
}
}
return converted.String()
return converted.String(), nil
}
// XXX: This convert function doesn't check the validity of the roman numerals string
func ConvertToArabic(roman string) uint16 {
var converted uint16
for _, numeral := range allRomanNumerals {

6
roman/roman_test.go
View File

@ -44,7 +44,7 @@ var cases = []struct {
func TestRomanNemerals(t *testing.T) {
for _, test := range cases {
t.Run(fmt.Sprintf("%d gets converted to %q", test.Arabic, test.Roman), func(t *testing.T) {
got := ConvertToRoman(test.Arabic)
got, _ := ConvertToRoman(test.Arabic)
want := test.Roman
if got != want {
@ -69,10 +69,10 @@ func TestConvertingToArabic(t *testing.T) {
func TestPropertiesOfConversion(t *testing.T) {
assertion := func(arabic uint16) bool {
roman, err := ConvertToRoman(arabic)
if arabic > 3999 {
return true
return err == ErrNumberOutOfRange
}
roman := ConvertToRoman(arabic)
fromRoman := ConvertToArabic(roman)
return fromRoman == arabic
}