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https://github.com/golang/go
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4ad5537bfa
This change accepts the 'i' suffix on binary and octal integer literals as well as hexadecimal floats. The suffix was already accepted on decimal integers and floats. Note that 0123i == 123i for backward-compatibility (and 09i is valid). See also the respective language in the spec change: https://golang.org/cl/161098 Change-Id: I9d2d755cba36a3fa7b9e24308c73754d4568daaf Reviewed-on: https://go-review.googlesource.com/c/162878 Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
// run
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// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test Go2 literal syntax for basic types.
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// Avoid running gofmt on this file to preserve the
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// test cases with upper-case prefixes (0B, 0O, 0X).
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package main
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import "fmt"
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func assert(cond bool) {
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if !cond {
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panic("assertion failed")
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}
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}
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func equal(x, y interface{}) bool {
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if x != y {
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fmt.Printf("%g != %g\n", x, y)
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return false
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}
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return true
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}
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func main() {
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// 0-octals
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assert(0_1 == 01)
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assert(012 == 012)
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assert(0_1_2 == 012)
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assert(0_1_2i == complex(0, 12)) // decimal digits despite leading 0 for backward-compatibility
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assert(00089i == complex(0, 89)) // decimal digits despite leading 0 for backward-compatibility
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// decimals
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assert(1_000_000 == 1000000)
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assert(1_000i == complex(0, 1000))
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// hexadecimals
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assert(0x_1 == 0x1)
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assert(0x1_2 == 0x12)
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assert(0x_cafe_f00d == 0xcafef00d)
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assert(0x_cafei == complex(0, 0xcafe))
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// octals
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assert(0o_1 == 01)
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assert(0o12 == 012)
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assert(0o_1_2 == 012)
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assert(0o_1_2i == complex(0, 0o12))
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// binaries
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assert(0b_1 == 1)
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assert(0b10 == 2)
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assert(0b_1_0 == 2)
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assert(0b_1_0i == complex(0, 2))
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// decimal floats
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assert(0. == 0.0)
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assert(.0 == 0.0)
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assert(1_0. == 10.0)
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assert(.0_1 == 0.01)
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assert(1_0.0_1 == 10.01)
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assert(1_0.0_1i == complex(0, 10.01))
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assert(0.e1_0 == 0.0e10)
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assert(.0e1_0 == 0.0e10)
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assert(1_0.e1_0 == 10.0e10)
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assert(.0_1e1_0 == 0.01e10)
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assert(1_0.0_1e1_0 == 10.01e10)
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assert(1_0.0_1e1_0i == complex(0, 10.01e10))
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// hexadecimal floats
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assert(equal(0x1p-2, 0.25))
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assert(equal(0x2.p10, 2048.0))
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assert(equal(0x1.Fp+0, 1.9375))
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assert(equal(0x.8p-0, 0.5))
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assert(equal(0x1FFFp-16, 0.1249847412109375))
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assert(equal(0x1.fffffffffffffp1023, 1.7976931348623157e308))
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assert(equal(0x1.fffffffffffffp1023i, complex(0, 1.7976931348623157e308)))
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assert(equal(0x_1p-2, 0.25))
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assert(equal(0x2.p1_0, 2048.0))
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assert(equal(0x1_0.Fp+0, 16.9375))
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assert(equal(0x_0.8p-0, 0.5))
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assert(equal(0x_1FF_Fp-16, 0.1249847412109375))
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assert(equal(0x1.f_ffff_ffff_ffffp1_023, 1.7976931348623157e308))
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assert(equal(0x1.f_ffff_ffff_ffffp1_023i, complex(0, 1.7976931348623157e308)))
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}
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