func TestDecScan(t *testing.T) {
tmp := new(inf.Dec)
for i, test := range decStringTests {
if test.scale < 0 {
// SetString only supports scale >= 0
continue
}
// initialize to a non-zero value so that issues with parsing
// 0 are detected
tmp.Set(inf.NewDec(1234567890, 123))
n1, n2 := new(inf.Dec), tmp
nn1, err1 := fmt.Sscan(test.in, n1)
nn2, err2 := fmt.Sscan(test.in, n2)
if !test.scanOk {
if err1 == nil || err2 == nil {
t.Errorf("#%d (input '%s') ok incorrect, should be %t", i, test.in, test.scanOk)
}
continue
}
expected := inf.NewDec(test.val, test.scale)
if nn1 != 1 || err1 != nil || nn2 != 1 || err2 != nil {
t.Errorf("#%d (input '%s') error %d %v, %d %v", i, test.in, nn1, err1, nn2, err2)
continue
}
if n1.Cmp(expected) != 0 {
t.Errorf("#%d (input '%s') got: %s want: %d", i, test.in, n1, test.val)
}
if n2.Cmp(expected) != 0 {
t.Errorf("#%d (input '%s') got: %s want: %d", i, test.in, n2, test.val)
}
}
}
func ExampleDec_QuoExact_fail() {
// 1 / 3 is an infinite decimal; it has no exact Dec representation
x, y := inf.NewDec(1, 0), inf.NewDec(3, 0)
z := new(inf.Dec).QuoExact(x, y)
fmt.Println(z)
// Output: <nil>
}
func ExampleDec_QuoExact_ok() {
// 1 / 25 is a finite decimal; it has exact Dec representation
x, y := inf.NewDec(1, 0), inf.NewDec(25, 0)
z := new(inf.Dec).QuoExact(x, y)
fmt.Println(z)
// Output: 0.04
}
func ExampleDec_QuoRound_scale2RoundCeil() {
// -42 / 400 is an finite decimal with 3 digits beyond the decimal point
x, y := inf.NewDec(-42, 0), inf.NewDec(400, 0)
// use 2 digits beyond decimal point, round towards positive infinity
z := new(inf.Dec).QuoRound(x, y, 2, inf.RoundCeil)
fmt.Println(z)
// Output: -0.10
}
func ExampleDec_QuoRound_scale2RoundDown() {
// 10 / 3 is an infinite decimal; it has no exact Dec representation
x, y := inf.NewDec(10, 0), inf.NewDec(3, 0)
// use 2 digits beyond the decimal point, round towards 0
z := new(inf.Dec).QuoRound(x, y, 2, inf.RoundDown)
fmt.Println(z)
// Output: 3.33
}
func TestDecSetString(t *testing.T) {
tmp := new(inf.Dec)
for i, test := range decStringTests {
if test.scale < 0 {
// SetString only supports scale >= 0
continue
}
// initialize to a non-zero value so that issues with parsing
// 0 are detected
tmp.Set(inf.NewDec(1234567890, 123))
n1, ok1 := new(inf.Dec).SetString(test.in)
n2, ok2 := tmp.SetString(test.in)
expected := inf.NewDec(test.val, test.scale)
if ok1 != test.ok || ok2 != test.ok {
t.Errorf("#%d (input '%s') ok incorrect (should be %t)", i, test.in, test.ok)
continue
}
if !ok1 {
if n1 != nil {
t.Errorf("#%d (input '%s') n1 != nil", i, test.in)
}
continue
}
if !ok2 {
if n2 != nil {
t.Errorf("#%d (input '%s') n2 != nil", i, test.in)
}
continue
}
if n1.Cmp(expected) != 0 {
t.Errorf("#%d (input '%s') got: %s want: %d", i, test.in, n1, test.val)
}
if n2.Cmp(expected) != 0 {
t.Errorf("#%d (input '%s') got: %s want: %d", i, test.in, n2, test.val)
}
}
}
func dec(i int64, exponent int) *inf.Dec {
// See the below test-- scale is the negative of an exponent.
return inf.NewDec(i, inf.Scale(-exponent))
}
"encoding/gob"
"fmt"
"math/big"
"strings"
"testing"
"github.com/appc/spec/Godeps/_workspace/src/speter.net/go/exp/math/dec/inf"
)
type decFunZZ func(z, x, y *inf.Dec) *inf.Dec
type decArgZZ struct {
z, x, y *inf.Dec
}
var decSumZZ = []decArgZZ{
{inf.NewDec(0, 0), inf.NewDec(0, 0), inf.NewDec(0, 0)},
{inf.NewDec(1, 0), inf.NewDec(1, 0), inf.NewDec(0, 0)},
{inf.NewDec(1111111110, 0), inf.NewDec(123456789, 0), inf.NewDec(987654321, 0)},
{inf.NewDec(-1, 0), inf.NewDec(-1, 0), inf.NewDec(0, 0)},
{inf.NewDec(864197532, 0), inf.NewDec(-123456789, 0), inf.NewDec(987654321, 0)},
{inf.NewDec(-1111111110, 0), inf.NewDec(-123456789, 0), inf.NewDec(-987654321, 0)},
{inf.NewDec(12, 2), inf.NewDec(1, 1), inf.NewDec(2, 2)},
}
var decProdZZ = []decArgZZ{
{inf.NewDec(0, 0), inf.NewDec(0, 0), inf.NewDec(0, 0)},
{inf.NewDec(0, 0), inf.NewDec(1, 0), inf.NewDec(0, 0)},
{inf.NewDec(1, 0), inf.NewDec(1, 0), inf.NewDec(1, 0)},
{inf.NewDec(-991*991, 0), inf.NewDec(991, 0), inf.NewDec(-991, 0)},
{inf.NewDec(2, 3), inf.NewDec(1, 1), inf.NewDec(2, 2)},
{inf.NewDec(2, -3), inf.NewDec(1, -1), inf.NewDec(2, -2)},
// NewMilliQuantity returns a new Quantity representing the given
// value * 1/1000 in the given format. Note that BinarySI formatting
// will round fractional values, and will be changed to DecimalSI for
// values x where (-1 < x < 1) && (x != 0).
func NewMilliQuantity(value int64, format Format) *Quantity {
return &Quantity{
Amount: inf.NewDec(value, 3),
Format: format,
}
}
splitRE = regexp.MustCompile(splitREString)
// Errors that could happen while parsing a string.
ErrFormatWrong = errors.New("quantities must match the regular expression '" + splitREString + "'")
ErrNumeric = errors.New("unable to parse numeric part of quantity")
ErrSuffix = errors.New("unable to parse quantity's suffix")
// Commonly needed big.Int values-- treat as read only!
bigTen = big.NewInt(10)
bigZero = big.NewInt(0)
bigOne = big.NewInt(1)
bigThousand = big.NewInt(1000)
big1024 = big.NewInt(1024)
// Commonly needed inf.Dec values-- treat as read only!
decZero = inf.NewDec(0, 0)
decOne = inf.NewDec(1, 0)
decMinusOne = inf.NewDec(-1, 0)
decThousand = inf.NewDec(1000, 0)
dec1024 = inf.NewDec(1024, 0)
decMinus1024 = inf.NewDec(-1024, 0)
// Largest (in magnitude) number allowed.
maxAllowed = inf.NewDec((1<<63)-1, 0) // == max int64
// The maximum value we can represent milli-units for.
// Compare with the return value of Quantity.Value() to
// see if it's safe to use Quantity.MilliValue().
MaxMilliValue = int64(((1 << 63) - 1) / 1000)
)
package inf_test
import (
"math/big"
"testing"
"github.com/appc/spec/Godeps/_workspace/src/speter.net/go/exp/math/dec/inf"
)
var decRounderInputs = [...]struct {
quo *inf.Dec
rA, rB *big.Int
}{
// examples from go language spec
{inf.NewDec(1, 0), big.NewInt(2), big.NewInt(3)}, // 5 / 3
{inf.NewDec(-1, 0), big.NewInt(-2), big.NewInt(3)}, // -5 / 3
{inf.NewDec(-1, 0), big.NewInt(2), big.NewInt(-3)}, // 5 / -3
{inf.NewDec(1, 0), big.NewInt(-2), big.NewInt(-3)}, // -5 / -3
// examples from godoc
{inf.NewDec(-1, 1), big.NewInt(-8), big.NewInt(10)},
{inf.NewDec(-1, 1), big.NewInt(-5), big.NewInt(10)},
{inf.NewDec(-1, 1), big.NewInt(-2), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(-8), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(-5), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(-2), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(0), big.NewInt(1)},
{inf.NewDec(0, 1), big.NewInt(2), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(5), big.NewInt(10)},
{inf.NewDec(0, 1), big.NewInt(8), big.NewInt(10)},
{inf.NewDec(1, 1), big.NewInt(2), big.NewInt(10)},
{inf.NewDec(1, 1), big.NewInt(5), big.NewInt(10)},