Contents

package trinary

import (
	"fmt"
	"math"
)

const testVersion = 1

func ParseTrinary(s string) (int64, error) {
	const third = math.MaxInt64 / 3
	overflow := false
	var d int64
	for _, r := range s {
		switch r {
		case '0', '1', '2':
			if overflow {
				continue
			}
			if d > third {
				overflow = true
				continue
			}
			d *= 3
			t := int64(r - '0')
			if t > math.MaxInt64-d {
				overflow = true
				continue
			}
			d += t
		default:
			return 0, fmt.Errorf("invalid: %s", s)
		}
	}
	if overflow {
		return 0, fmt.Errorf("overflow: %s", s)
	}
	return d, nil
}

Version data entries

274 entries across 274 versions & 1 rubygems

Version	Path
trackler-2.2.1.56	tracks/go/exercises/trinary/example.go
trackler-2.2.1.55	tracks/go/exercises/trinary/example.go
trackler-2.2.1.54	tracks/go/exercises/trinary/example.go
trackler-2.2.1.53	tracks/go/exercises/trinary/example.go
trackler-2.2.1.52	tracks/go/exercises/trinary/example.go
trackler-2.2.1.51	tracks/go/exercises/trinary/example.go
trackler-2.2.1.50	tracks/go/exercises/trinary/example.go
trackler-2.2.1.49	tracks/go/exercises/trinary/example.go
trackler-2.2.1.48	tracks/go/exercises/trinary/example.go
trackler-2.2.1.47	tracks/go/exercises/trinary/example.go
trackler-2.2.1.46	tracks/go/exercises/trinary/example.go
trackler-2.2.1.45	tracks/go/exercises/trinary/example.go
trackler-2.2.1.44	tracks/go/exercises/trinary/example.go
trackler-2.2.1.43	tracks/go/exercises/trinary/example.go
trackler-2.2.1.42	tracks/go/exercises/trinary/example.go
trackler-2.2.1.41	tracks/go/exercises/trinary/example.go
trackler-2.2.1.40	tracks/go/exercises/trinary/example.go
trackler-2.2.1.39	tracks/go/exercises/trinary/example.go
trackler-2.2.1.38	tracks/go/exercises/trinary/example.go
trackler-2.2.1.37	tracks/go/exercises/trinary/example.go