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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") }