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// Copyright 2009 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 strconv_test
import (
"math";
. "strconv";
"testing";
)
type ftoaTest struct {
f float64;
fmt byte;
prec int;
s string;
}
func fdiv(a, b float64) float64 {
return a/b;
} // keep compiler in the dark
const (
below1e23 = 99999999999999974834176;
above1e23 = 100000000000000008388608;
)
var ftoatests = []ftoaTest{
ftoaTest{1, 'e', 5, "1.00000e+00"},
ftoaTest{1, 'f', 5, "1.00000"},
ftoaTest{1, 'g', 5, "1"},
ftoaTest{1, 'g', -1, "1"},
ftoaTest{20, 'g', -1, "20"},
ftoaTest{1234567.8, 'g', -1, "1.2345678e+06"},
ftoaTest{200000, 'g', -1, "200000"},
ftoaTest{2000000, 'g', -1, "2e+06"},
ftoaTest{0, 'e', 5, "0.00000e+00"},
ftoaTest{0, 'f', 5, "0.00000"},
ftoaTest{0, 'g', 5, "0"},
ftoaTest{0, 'g', -1, "0"},
ftoaTest{-1, 'e', 5, "-1.00000e+00"},
ftoaTest{-1, 'f', 5, "-1.00000"},
ftoaTest{-1, 'g', 5, "-1"},
ftoaTest{-1, 'g', -1, "-1"},
ftoaTest{12, 'e', 5, "1.20000e+01"},
ftoaTest{12, 'f', 5, "12.00000"},
ftoaTest{12, 'g', 5, "12"},
ftoaTest{12, 'g', -1, "12"},
ftoaTest{123456700, 'e', 5, "1.23457e+08"},
ftoaTest{123456700, 'f', 5, "123456700.00000"},
ftoaTest{123456700, 'g', 5, "1.2346e+08"},
ftoaTest{123456700, 'g', -1, "1.234567e+08"},
ftoaTest{1.2345e6, 'e', 5, "1.23450e+06"},
ftoaTest{1.2345e6, 'f', 5, "1234500.00000"},
ftoaTest{1.2345e6, 'g', 5, "1.2345e+06"},
ftoaTest{1e23, 'e', 17, "9.99999999999999916e+22"},
ftoaTest{1e23, 'f', 17, "99999999999999991611392.00000000000000000"},
ftoaTest{1e23, 'g', 17, "9.9999999999999992e+22"},
ftoaTest{1e23, 'e', -1, "1e+23"},
ftoaTest{1e23, 'f', -1, "100000000000000000000000"},
ftoaTest{1e23, 'g', -1, "1e+23"},
ftoaTest{below1e23, 'e', 17, "9.99999999999999748e+22"},
ftoaTest{below1e23, 'f', 17, "99999999999999974834176.00000000000000000"},
ftoaTest{below1e23, 'g', 17, "9.9999999999999975e+22"},
ftoaTest{below1e23, 'e', -1, "9.999999999999997e+22"},
ftoaTest{below1e23, 'f', -1, "99999999999999970000000"},
ftoaTest{below1e23, 'g', -1, "9.999999999999997e+22"},
ftoaTest{above1e23, 'e', 17, "1.00000000000000008e+23"},
ftoaTest{above1e23, 'f', 17, "100000000000000008388608.00000000000000000"},
ftoaTest{above1e23, 'g', 17, "1.0000000000000001e+23"},
ftoaTest{above1e23, 'e', -1, "1.0000000000000001e+23"},
ftoaTest{above1e23, 'f', -1, "100000000000000010000000"},
ftoaTest{above1e23, 'g', -1, "1.0000000000000001e+23"},
ftoaTest{fdiv(5e-304, 1e20), 'g', -1, "5e-324"},
ftoaTest{fdiv(-5e-304, 1e20), 'g', -1, "-5e-324"},
ftoaTest{32, 'g', -1, "32"},
ftoaTest{32, 'g', 0, "3e+01"},
ftoaTest{100, 'x', -1, "%x"},
ftoaTest{math.NaN(), 'g', -1, "NaN"},
ftoaTest{-math.NaN(), 'g', -1, "NaN"},
ftoaTest{math.Inf(0), 'g', -1, "+Inf"},
ftoaTest{math.Inf(-1), 'g', -1, "-Inf"},
ftoaTest{-math.Inf(0), 'g', -1, "-Inf"},
ftoaTest{-1, 'b', -1, "-4503599627370496p-52"},
}
func TestFtoa(t *testing.T) {
if FloatSize != 32 {
panic("floatsize: ", FloatSize);
}
for i := 0; i < len(ftoatests); i++ {
test := &ftoatests[i];
s := Ftoa64(test.f, test.fmt, test.prec);
if s != test.s {
t.Error("test", test.f, string(test.fmt), test.prec, "want", test.s, "got", s);
}
if float64(float32(test.f)) == test.f && test.fmt != 'b' {
s := Ftoa32(float32(test.f), test.fmt, test.prec);
if s != test.s {
t.Error("test32", test.f, string(test.fmt), test.prec, "want", test.s, "got", s);
}
}
}
}
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