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48 lines
1.5 KiB
48 lines
1.5 KiB
package math
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import (
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"errors"
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"fmt"
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"math"
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"strconv"
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"strings"
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)
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// Fraction defined in terms of a numerator divided by a denominator in uint64
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// format. Fraction must be positive.
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type Fraction struct {
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// The portion of the denominator in the faction, e.g. 2 in 2/3.
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Numerator uint64 `json:"numerator"`
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// The value by which the numerator is divided, e.g. 3 in 2/3.
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Denominator uint64 `json:"denominator"`
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}
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func (fr Fraction) String() string {
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return fmt.Sprintf("%d/%d", fr.Numerator, fr.Denominator)
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}
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// ParseFractions takes the string of a fraction as input i.e "2/3" and converts this
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// to the equivalent fraction else returns an error. The format of the string must be
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// one number followed by a slash (/) and then the other number.
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func ParseFraction(f string) (Fraction, error) {
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o := strings.Split(f, "/")
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if len(o) != 2 {
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return Fraction{}, errors.New("incorrect formating: should have a single slash i.e. \"1/3\"")
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}
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numerator, err := strconv.ParseUint(o[0], 10, 64)
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if err != nil {
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return Fraction{}, fmt.Errorf("incorrect formatting, err: %w", err)
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}
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denominator, err := strconv.ParseUint(o[1], 10, 64)
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if err != nil {
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return Fraction{}, fmt.Errorf("incorrect formatting, err: %w", err)
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}
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if denominator == 0 {
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return Fraction{}, errors.New("denominator can't be 0")
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}
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if numerator > math.MaxInt64 || denominator > math.MaxInt64 {
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return Fraction{}, fmt.Errorf("value overflow, numerator and denominator must be less than %d", int64(math.MaxInt64))
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}
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return Fraction{Numerator: numerator, Denominator: denominator}, nil
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}
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