Editando: float_lit3.go
// errorcheck // Check flagging of invalid conversion of constant to float32/float64 near min/max boundaries. // Copyright 2014 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 main // See float_lit2.go for motivation for these values. const ( two24 = 1.0 * (1 << 24) two53 = 1.0 * (1 << 53) two64 = 1.0 * (1 << 64) two128 = two64 * two64 two256 = two128 * two128 two512 = two256 * two256 two768 = two512 * two256 two1024 = two512 * two512 ulp32 = two128 / two24 max32 = two128 - ulp32 ulp64 = two1024 / two53 max64 = two1024 - ulp64 ) var x = []interface{}{ float32(max32 + ulp32/2 - 1), // ok float32(max32 + ulp32/2 - two128/two256), // ok float32(max32 + ulp32/2), // ERROR "constant 3\.40282e\+38 overflows float32|cannot convert.*to type float32" float32(-max32 - ulp32/2 + 1), // ok float32(-max32 - ulp32/2 + two128/two256), // ok float32(-max32 - ulp32/2), // ERROR "constant -3\.40282e\+38 overflows float32|cannot convert.*to type float32" // If the compiler's internal floating point representation // is shorter than 1024 bits, it cannot distinguish max64+ulp64/2-1 and max64+ulp64/2. float64(max64 + ulp64/2 - two1024/two256), // ok float64(max64 + ulp64/2 - 1), // ok float64(max64 + ulp64/2), // ERROR "constant 1\.79769e\+308 overflows float64|cannot convert.*to type float64" float64(-max64 - ulp64/2 + two1024/two256), // ok float64(-max64 - ulp64/2 + 1), // ok float64(-max64 - ulp64/2), // ERROR "constant -1\.79769e\+308 overflows float64|cannot convert.*to type float64" }
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Kerym Chaeceran