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Current File : /proc/self/root/proc/self/root/opt/golang/1.19.4/test/const.go

// run

// 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.

// Test simple boolean and numeric constants.

package main

import "os"

const (
	c0      = 0
	cm1     = -1
	chuge   = 1 << 100
	chuge_1 = chuge - 1
	c1      = chuge >> 100
	c3div2  = 3 / 2
	c1e3    = 1e3

	rsh1 = 1e100 >> 1000
	rsh2 = 1e302 >> 1000

	ctrue  = true
	cfalse = !ctrue

	// Issue #34563
	_ = string(int(123))
	_ = string(rune(456))
)

const (
	f0              = 0.0
	fm1             = -1.
	fhuge   float64 = 1 << 100
	fhuge_1 float64 = chuge - 1
	f1      float64 = chuge >> 100
	f3div2          = 3. / 2.
	f1e3    float64 = 1e3
)

func assert(t bool, s string) {
	if !t {
		panic(s)
	}
}

func ints() {
	assert(c0 == 0, "c0")
	assert(c1 == 1, "c1")
	assert(chuge > chuge_1, "chuge")
	assert(chuge_1+1 == chuge, "chuge 1")
	assert(chuge+cm1+1 == chuge, "cm1")
	assert(c3div2 == 1, "3/2")
	assert(c1e3 == 1000, "c1e3 int")
	assert(c1e3 == 1e3, "c1e3 float")
	assert(rsh1 == 0, "rsh1")
	assert(rsh2 == 9, "rsh2")

	// verify that all (in range) are assignable as ints
	var i int
	i = c0
	assert(i == c0, "i == c0")
	i = cm1
	assert(i == cm1, "i == cm1")
	i = c1
	assert(i == c1, "i == c1")
	i = c3div2
	assert(i == c3div2, "i == c3div2")
	i = c1e3
	assert(i == c1e3, "i == c1e3")

	// verify that all are assignable as floats
	var f float64
	f = c0
	assert(f == c0, "f == c0")
	f = cm1
	assert(f == cm1, "f == cm1")
	f = chuge
	assert(f == chuge, "f == chuge")
	f = chuge_1
	assert(f == chuge_1, "f == chuge_1")
	f = c1
	assert(f == c1, "f == c1")
	f = c3div2
	assert(f == c3div2, "f == c3div2")
	f = c1e3
	assert(f == c1e3, "f == c1e3")
}

func floats() {
	assert(f0 == c0, "f0")
	assert(f1 == c1, "f1")
	// TODO(gri): exp/ssa/interp constant folding is incorrect.
	if os.Getenv("GOSSAINTERP") == "" {
		assert(fhuge == fhuge_1, "fhuge") // float64 can't distinguish fhuge, fhuge_1.
	}
	assert(fhuge_1+1 == fhuge, "fhuge 1")
	assert(fhuge+fm1+1 == fhuge, "fm1")
	assert(f3div2 == 1.5, "3./2.")
	assert(f1e3 == 1000, "f1e3 int")
	assert(f1e3 == 1.e3, "f1e3 float")

	// verify that all (in range) are assignable as ints
	var i int
	i = f0
	assert(i == f0, "i == f0")
	i = fm1
	assert(i == fm1, "i == fm1")

	// verify that all are assignable as floats
	var f float64
	f = f0
	assert(f == f0, "f == f0")
	f = fm1
	assert(f == fm1, "f == fm1")
	f = fhuge
	assert(f == fhuge, "f == fhuge")
	f = fhuge_1
	assert(f == fhuge_1, "f == fhuge_1")
	f = f1
	assert(f == f1, "f == f1")
	f = f3div2
	assert(f == f3div2, "f == f3div2")
	f = f1e3
	assert(f == f1e3, "f == f1e3")
}

func interfaces() {
	var (
		nilN interface{}
		nilI *int
		five = 5

		_ = nil == interface{}(nil)
		_ = interface{}(nil) == nil
	)
	ii := func(i1 interface{}, i2 interface{}) bool { return i1 == i2 }
	ni := func(n interface{}, i int) bool { return n == i }
	in := func(i int, n interface{}) bool { return i == n }
	pi := func(p *int, i interface{}) bool { return p == i }
	ip := func(i interface{}, p *int) bool { return i == p }

	assert((interface{}(nil) == interface{}(nil)) == ii(nilN, nilN),
		"for interface{}==interface{} compiler == runtime")

	assert(((*int)(nil) == interface{}(nil)) == pi(nilI, nilN),
		"for *int==interface{} compiler == runtime")
	assert((interface{}(nil) == (*int)(nil)) == ip(nilN, nilI),
		"for interface{}==*int compiler == runtime")

	assert((&five == interface{}(nil)) == pi(&five, nilN),
		"for interface{}==*int compiler == runtime")
	assert((interface{}(nil) == &five) == ip(nilN, &five),
		"for interface{}==*int compiler == runtime")

	assert((5 == interface{}(5)) == ni(five, five),
		"for int==interface{} compiler == runtime")
	assert((interface{}(5) == 5) == in(five, five),
		"for interface{}==int comipiler == runtime")
}

// Test that typed floating-point and complex arithmetic
// is computed with correct precision.
func truncate() {
	const (
		x30 = 1 << 30
		x60 = 1 << 60

		staticF32 = float32(x30) + 1 - x30
		staticF64 = float64(x60) + 1 - x60
		staticC64 = complex64(x30) + 1 - x30
		staticC128 = complex128(x60) + 1 - x60
	)
	dynamicF32 := float32(x30)
	dynamicF32 += 1
	dynamicF32 -= x30

	dynamicF64 := float64(x60)
	dynamicF64 += 1
	dynamicF64 -= x60

	dynamicC64 := complex64(x30)
	dynamicC64 += 1
	dynamicC64 -= x30

	dynamicC128 := complex128(x60)
	dynamicC128 += 1
	dynamicC128 -= x60

	assert(staticF32 == 0, "staticF32 == 0")
	assert(staticF64 == 0, "staticF64 == 0")
	assert(dynamicF32 == 0, "dynamicF32 == 0")
	assert(dynamicF64 == 0, "dynamicF64 == 0")
	assert(staticC64 == 0, "staticC64 == 0")
	assert(staticC128 == 0, "staticC128 == 0")
	assert(dynamicC64 == 0, "dynamicC64 == 0")
	assert(dynamicC128 == 0, "dynamicC128 == 0")
}

func main() {
	ints()
	floats()
	interfaces()
	truncate()

	assert(ctrue == true, "ctrue == true")
	assert(cfalse == false, "cfalse == false")
}

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