mirror of git://gcc.gnu.org/git/gcc.git
117 lines
3.0 KiB
Go
117 lines
3.0 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package big
|
|
|
|
import "testing"
|
|
|
|
func TestDecimalString(t *testing.T) {
|
|
for _, test := range []struct {
|
|
x decimal
|
|
want string
|
|
}{
|
|
{want: "0"},
|
|
{decimal{nil, 1000}, "0"}, // exponent of 0 is ignored
|
|
{decimal{[]byte("12345"), 0}, "0.12345"},
|
|
{decimal{[]byte("12345"), -3}, "0.00012345"},
|
|
{decimal{[]byte("12345"), +3}, "123.45"},
|
|
{decimal{[]byte("12345"), +10}, "1234500000"},
|
|
} {
|
|
if got := test.x.String(); got != test.want {
|
|
t.Errorf("%v == %s; want %s", test.x, got, test.want)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestDecimalInit(t *testing.T) {
|
|
for _, test := range []struct {
|
|
x Word
|
|
shift int
|
|
want string
|
|
}{
|
|
{0, 0, "0"},
|
|
{0, -100, "0"},
|
|
{0, 100, "0"},
|
|
{1, 0, "1"},
|
|
{1, 10, "1024"},
|
|
{1, 100, "1267650600228229401496703205376"},
|
|
{1, -100, "0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625"},
|
|
{12345678, 8, "3160493568"},
|
|
{12345678, -8, "48225.3046875"},
|
|
{195312, 9, "99999744"},
|
|
{1953125, 9, "1000000000"},
|
|
} {
|
|
var d decimal
|
|
d.init(nat{test.x}.norm(), test.shift)
|
|
if got := d.String(); got != test.want {
|
|
t.Errorf("%d << %d == %s; want %s", test.x, test.shift, got, test.want)
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestDecimalRounding(t *testing.T) {
|
|
for _, test := range []struct {
|
|
x uint64
|
|
n int
|
|
down, even, up string
|
|
}{
|
|
{0, 0, "0", "0", "0"},
|
|
{0, 1, "0", "0", "0"},
|
|
|
|
{1, 0, "0", "0", "10"},
|
|
{5, 0, "0", "0", "10"},
|
|
{9, 0, "0", "10", "10"},
|
|
|
|
{15, 1, "10", "20", "20"},
|
|
{45, 1, "40", "40", "50"},
|
|
{95, 1, "90", "100", "100"},
|
|
|
|
{12344999, 4, "12340000", "12340000", "12350000"},
|
|
{12345000, 4, "12340000", "12340000", "12350000"},
|
|
{12345001, 4, "12340000", "12350000", "12350000"},
|
|
{23454999, 4, "23450000", "23450000", "23460000"},
|
|
{23455000, 4, "23450000", "23460000", "23460000"},
|
|
{23455001, 4, "23450000", "23460000", "23460000"},
|
|
|
|
{99994999, 4, "99990000", "99990000", "100000000"},
|
|
{99995000, 4, "99990000", "100000000", "100000000"},
|
|
{99999999, 4, "99990000", "100000000", "100000000"},
|
|
|
|
{12994999, 4, "12990000", "12990000", "13000000"},
|
|
{12995000, 4, "12990000", "13000000", "13000000"},
|
|
{12999999, 4, "12990000", "13000000", "13000000"},
|
|
} {
|
|
x := nat(nil).setUint64(test.x)
|
|
|
|
var d decimal
|
|
d.init(x, 0)
|
|
d.roundDown(test.n)
|
|
if got := d.String(); got != test.down {
|
|
t.Errorf("roundDown(%d, %d) = %s; want %s", test.x, test.n, got, test.down)
|
|
}
|
|
|
|
d.init(x, 0)
|
|
d.round(test.n)
|
|
if got := d.String(); got != test.even {
|
|
t.Errorf("round(%d, %d) = %s; want %s", test.x, test.n, got, test.even)
|
|
}
|
|
|
|
d.init(x, 0)
|
|
d.roundUp(test.n)
|
|
if got := d.String(); got != test.up {
|
|
t.Errorf("roundUp(%d, %d) = %s; want %s", test.x, test.n, got, test.up)
|
|
}
|
|
}
|
|
}
|
|
|
|
func BenchmarkDecimalConversion(b *testing.B) {
|
|
for i := 0; i < b.N; i++ {
|
|
for shift := -100; shift <= +100; shift++ {
|
|
var d decimal
|
|
d.init(natOne, shift)
|
|
d.String()
|
|
}
|
|
}
|
|
}
|