codekingpro/portable-devtools

1// Copyright 2015 The Go Authors. All rights reserved.2// Use of this source code is governed by a BSD-style3// license that can be found in the LICENSE file.4 5package big6 7import (8	"fmt"9	"testing"10)11 12func TestDecimalString(t *testing.T) {13	for _, test := range []struct {14		x    decimal15		want string16	}{17		{want: "0"},18		{decimal{nil, 1000}, "0"}, // exponent of 0 is ignored19		{decimal{[]byte("12345"), 0}, "0.12345"},20		{decimal{[]byte("12345"), -3}, "0.00012345"},21		{decimal{[]byte("12345"), +3}, "123.45"},22		{decimal{[]byte("12345"), +10}, "1234500000"},23	} {24		if got := test.x.String(); got != test.want {25			t.Errorf("%v == %s; want %s", test.x, got, test.want)26		}27	}28}29 30func TestDecimalInit(t *testing.T) {31	for _, test := range []struct {32		x     Word33		shift int34		want  string35	}{36		{0, 0, "0"},37		{0, -100, "0"},38		{0, 100, "0"},39		{1, 0, "1"},40		{1, 10, "1024"},41		{1, 100, "1267650600228229401496703205376"},42		{1, -100, "0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625"},43		{12345678, 8, "3160493568"},44		{12345678, -8, "48225.3046875"},45		{195312, 9, "99999744"},46		{1953125, 9, "1000000000"},47	} {48		var d decimal49		d.init(nat{test.x}.norm(), test.shift)50		if got := d.String(); got != test.want {51			t.Errorf("%d << %d == %s; want %s", test.x, test.shift, got, test.want)52		}53	}54}55 56func TestDecimalRounding(t *testing.T) {57	for _, test := range []struct {58		x              uint6459		n              int60		down, even, up string61	}{62		{0, 0, "0", "0", "0"},63		{0, 1, "0", "0", "0"},64 65		{1, 0, "0", "0", "10"},66		{5, 0, "0", "0", "10"},67		{9, 0, "0", "10", "10"},68 69		{15, 1, "10", "20", "20"},70		{45, 1, "40", "40", "50"},71		{95, 1, "90", "100", "100"},72 73		{12344999, 4, "12340000", "12340000", "12350000"},74		{12345000, 4, "12340000", "12340000", "12350000"},75		{12345001, 4, "12340000", "12350000", "12350000"},76		{23454999, 4, "23450000", "23450000", "23460000"},77		{23455000, 4, "23450000", "23460000", "23460000"},78		{23455001, 4, "23450000", "23460000", "23460000"},79 80		{99994999, 4, "99990000", "99990000", "100000000"},81		{99995000, 4, "99990000", "100000000", "100000000"},82		{99999999, 4, "99990000", "100000000", "100000000"},83 84		{12994999, 4, "12990000", "12990000", "13000000"},85		{12995000, 4, "12990000", "13000000", "13000000"},86		{12999999, 4, "12990000", "13000000", "13000000"},87	} {88		x := nat(nil).setUint64(test.x)89 90		var d decimal91		d.init(x, 0)92		d.roundDown(test.n)93		if got := d.String(); got != test.down {94			t.Errorf("roundDown(%d, %d) = %s; want %s", test.x, test.n, got, test.down)95		}96 97		d.init(x, 0)98		d.round(test.n)99		if got := d.String(); got != test.even {100			t.Errorf("round(%d, %d) = %s; want %s", test.x, test.n, got, test.even)101		}102 103		d.init(x, 0)104		d.roundUp(test.n)105		if got := d.String(); got != test.up {106			t.Errorf("roundUp(%d, %d) = %s; want %s", test.x, test.n, got, test.up)107		}108	}109}110 111var sink string112 113func BenchmarkDecimalConversion(b *testing.B) {114	for i := 0; i < b.N; i++ {115		for shift := -100; shift <= +100; shift++ {116			var d decimal117			d.init(natOne, shift)118			sink = d.String()119		}120	}121}122 123func BenchmarkFloatString(b *testing.B) {124	x := new(Float)125	for _, prec := range []uint{1e2, 1e3, 1e4, 1e5} {126		x.SetPrec(prec).SetRat(NewRat(1, 3))127		b.Run(fmt.Sprintf("%v", prec), func(b *testing.B) {128			b.ReportAllocs()129			for i := 0; i < b.N; i++ {130				sink = x.String()131			}132		})133	}134}135