You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
1.5 KiB
48 lines
1.5 KiB
package math
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
// Fraction defined in terms of a numerator divided by a denominator in uint64
|
|
// format. Fraction must be positive.
|
|
type Fraction struct {
|
|
// The portion of the denominator in the faction, e.g. 2 in 2/3.
|
|
Numerator uint64 `json:"numerator"`
|
|
// The value by which the numerator is divided, e.g. 3 in 2/3.
|
|
Denominator uint64 `json:"denominator"`
|
|
}
|
|
|
|
func (fr Fraction) String() string {
|
|
return fmt.Sprintf("%d/%d", fr.Numerator, fr.Denominator)
|
|
}
|
|
|
|
// ParseFractions takes the string of a fraction as input i.e "2/3" and converts this
|
|
// to the equivalent fraction else returns an error. The format of the string must be
|
|
// one number followed by a slash (/) and then the other number.
|
|
func ParseFraction(f string) (Fraction, error) {
|
|
o := strings.Split(f, "/")
|
|
if len(o) != 2 {
|
|
return Fraction{}, errors.New("incorrect formating: should have a single slash i.e. \"1/3\"")
|
|
}
|
|
numerator, err := strconv.ParseUint(o[0], 10, 64)
|
|
if err != nil {
|
|
return Fraction{}, fmt.Errorf("incorrect formatting, err: %w", err)
|
|
}
|
|
|
|
denominator, err := strconv.ParseUint(o[1], 10, 64)
|
|
if err != nil {
|
|
return Fraction{}, fmt.Errorf("incorrect formatting, err: %w", err)
|
|
}
|
|
if denominator == 0 {
|
|
return Fraction{}, errors.New("denominator can't be 0")
|
|
}
|
|
if numerator > math.MaxInt64 || denominator > math.MaxInt64 {
|
|
return Fraction{}, fmt.Errorf("value overflow, numerator and denominator must be less than %d", math.MaxInt64)
|
|
}
|
|
return Fraction{Numerator: numerator, Denominator: denominator}, nil
|
|
}
|