codekingpro/portable-devtools

1// run2 3// Copyright 2009 The Go Authors. All rights reserved.4// Use of this source code is governed by a BSD-style5// license that can be found in the LICENSE file.6 7// Test floating-point comparison involving NaN.8 9package main10 11import "math"12 13type floatTest struct {14	name string15	expr bool16	want bool17}18 19var nan float64 = math.NaN()20var f float64 = 121 22var tests = []floatTest{23	floatTest{"nan == nan", nan == nan, false},24	floatTest{"nan != nan", nan != nan, true},25	floatTest{"nan < nan", nan < nan, false},26	floatTest{"nan > nan", nan > nan, false},27	floatTest{"nan <= nan", nan <= nan, false},28	floatTest{"nan >= nan", nan >= nan, false},29	floatTest{"f == nan", f == nan, false},30	floatTest{"f != nan", f != nan, true},31	floatTest{"f < nan", f < nan, false},32	floatTest{"f > nan", f > nan, false},33	floatTest{"f <= nan", f <= nan, false},34	floatTest{"f >= nan", f >= nan, false},35	floatTest{"nan == f", nan == f, false},36	floatTest{"nan != f", nan != f, true},37	floatTest{"nan < f", nan < f, false},38	floatTest{"nan > f", nan > f, false},39	floatTest{"nan <= f", nan <= f, false},40	floatTest{"nan >= f", nan >= f, false},41	floatTest{"!(nan == nan)", !(nan == nan), true},42	floatTest{"!(nan != nan)", !(nan != nan), false},43	floatTest{"!(nan < nan)", !(nan < nan), true},44	floatTest{"!(nan > nan)", !(nan > nan), true},45	floatTest{"!(nan <= nan)", !(nan <= nan), true},46	floatTest{"!(nan >= nan)", !(nan >= nan), true},47	floatTest{"!(f == nan)", !(f == nan), true},48	floatTest{"!(f != nan)", !(f != nan), false},49	floatTest{"!(f < nan)", !(f < nan), true},50	floatTest{"!(f > nan)", !(f > nan), true},51	floatTest{"!(f <= nan)", !(f <= nan), true},52	floatTest{"!(f >= nan)", !(f >= nan), true},53	floatTest{"!(nan == f)", !(nan == f), true},54	floatTest{"!(nan != f)", !(nan != f), false},55	floatTest{"!(nan < f)", !(nan < f), true},56	floatTest{"!(nan > f)", !(nan > f), true},57	floatTest{"!(nan <= f)", !(nan <= f), true},58	floatTest{"!(nan >= f)", !(nan >= f), true},59	floatTest{"!!(nan == nan)", !!(nan == nan), false},60	floatTest{"!!(nan != nan)", !!(nan != nan), true},61	floatTest{"!!(nan < nan)", !!(nan < nan), false},62	floatTest{"!!(nan > nan)", !!(nan > nan), false},63	floatTest{"!!(nan <= nan)", !!(nan <= nan), false},64	floatTest{"!!(nan >= nan)", !!(nan >= nan), false},65	floatTest{"!!(f == nan)", !!(f == nan), false},66	floatTest{"!!(f != nan)", !!(f != nan), true},67	floatTest{"!!(f < nan)", !!(f < nan), false},68	floatTest{"!!(f > nan)", !!(f > nan), false},69	floatTest{"!!(f <= nan)", !!(f <= nan), false},70	floatTest{"!!(f >= nan)", !!(f >= nan), false},71	floatTest{"!!(nan == f)", !!(nan == f), false},72	floatTest{"!!(nan != f)", !!(nan != f), true},73	floatTest{"!!(nan < f)", !!(nan < f), false},74	floatTest{"!!(nan > f)", !!(nan > f), false},75	floatTest{"!!(nan <= f)", !!(nan <= f), false},76	floatTest{"!!(nan >= f)", !!(nan >= f), false},77}78 79func main() {80	bad := false81	for _, t := range tests {82		if t.expr != t.want {83			if !bad {84				bad = true85				println("BUG: floatcmp")86			}87			println(t.name, "=", t.expr, "want", t.want)88		}89	}90	if bad {91		panic("floatcmp failed")92	}93}94