Re: [go-nuts] Re: Conversion to Complex numbers
On Fri, Mar 27, 2020 at 9:27 AM wrote:
>
>
> On Friday, 27 March 2020 16:16:18 UTC, Stephen Illingworth wrote:
>>
>>
>>
>> On Friday, 27 March 2020 15:58:19 UTC, Brian Candler wrote:
>>>
>>> On Friday, 27 March 2020 15:42:08 UTC, stephen.i...@gmail.com wrote:
// float -> complex
const constFloat = 1
>>>
>>> Did you mean const constFloat = 1.0 ?
>>
>>
>> Yes. Results are the same.
>
>
> Corrected test program. Results are the same:
>
> package main
>
> import "testing"
>
> // int -> complex
>
> const constInt = 1
>
> func TestConstInt(t *testing.T) {
> _ = complex64(constInt)
> }
>
> const constIntExplicit = int(1)
>
> func TestConstIntExplicit(t *testing.T) {
> _ = complex64(constIntExplicit)
> }
>
> func TestVarInt(t *testing.T) {
> varInt := 1
> _ = complex64(varInt)
> }
>
> func TestVarIntExplicit(t *testing.T) {
> varIntExplicit := int(1)
> _ = complex64(varIntExplicit)
> }
>
> // float -> complex
>
> const constFloat = 1.0
>
> func TestConstFloat(t *testing.T) {
> _ = complex64(constFloat)
> }
>
> const constFloatExplicit = float64(1.0)
>
> func TestConstFloatExplicit(t *testing.T) {
> _ = complex64(constFloatExplicit)
> }
>
> func TestVarFloat(t *testing.T) {
> varFloat := 1.0
> _ = complex64(varFloat)
> }
>
> func TestVarFloatExplicit(t *testing.T) {
> varFloatExplicit := float64(1.0)
> _ = complex64(varFloatExplicit)
> }
The language spec does not support conversions between ints/floats and
complex numbers. The exact rules are written down at
https://golang.org/ref/spec#Conversions.
But it's interesting that the behavior of typed constants changed
between 1.13 and 1.14. I suspect that was changed in
https://golang.org/cl/187657. The spec is not precisely clear on how
typed constant values should be handled. Please open a bug report for
that case at https://golang.org/issue. Thanks.
Ian
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[go-nuts] Re: Conversion to Complex numbers
On Friday, 27 March 2020 16:16:18 UTC, Stephen Illingworth wrote:
>
>
>
> On Friday, 27 March 2020 15:58:19 UTC, Brian Candler wrote:
>>
>> On Friday, 27 March 2020 15:42:08 UTC, stephen.i...@gmail.com wrote:
>>>
>>> // float -> complex
>>>
>>> const constFloat = 1
>>>
>>>
>> Did you mean const constFloat = 1.0 ?
>>
>
> Yes. Results are the same.
>
Corrected test program. Results are the same:
package main
import "testing"
// int -> complex
const constInt = 1
func TestConstInt(t *testing.T) {
_ = complex64(constInt)
}
const constIntExplicit = int(1)
func TestConstIntExplicit(t *testing.T) {
_ = complex64(constIntExplicit)
}
func TestVarInt(t *testing.T) {
varInt := 1
_ = complex64(varInt)
}
func TestVarIntExplicit(t *testing.T) {
varIntExplicit := int(1)
_ = complex64(varIntExplicit)
}
// float -> complex
const constFloat = 1.0
func TestConstFloat(t *testing.T) {
_ = complex64(constFloat)
}
const constFloatExplicit = float64(1.0)
func TestConstFloatExplicit(t *testing.T) {
_ = complex64(constFloatExplicit)
}
func TestVarFloat(t *testing.T) {
varFloat := 1.0
_ = complex64(varFloat)
}
func TestVarFloatExplicit(t *testing.T) {
varFloatExplicit := float64(1.0)
_ = complex64(varFloatExplicit)
}
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[go-nuts] Re: Conversion to Complex numbers
On Friday, 27 March 2020 15:58:19 UTC, Brian Candler wrote: > > On Friday, 27 March 2020 15:42:08 UTC, stephen.i...@gmail.com wrote: >> >> // float -> complex >> >> const constFloat = 1 >> >> > Did you mean const constFloat = 1.0 ? > Yes. Results are the same. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/5432c674-a237-493d-924c-9337b074156b%40googlegroups.com.
[go-nuts] Re: Conversion to Complex numbers
On Friday, 27 March 2020 15:42:08 UTC, stephen.i...@gmail.com wrote: > > // float -> complex > > const constFloat = 1 > > Did you mean const constFloat = 1.0 ? > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/cadcfeb6-d19c-411d-b1c4-e0e86853b80f%40googlegroups.com.
