I thought "100" has a specific size then "num" has the copy of "100".
var num int32 = 100
So in this case below, "100" is passed to the function "f" is also "4"
bytes in total?
func main() {
> f(100)
> }
>
> func f(num int32) { // num is "4" bytes
>
> }
2019年1月31日木曜日 9時05分32秒 UTC+9 伊藤和也:
>
> An interger constant is "int" type and takes "8" bytes memory on 64-bit
> system.
>
> fmt.Println(unsafe.Sizeof(100)) // 8
>> fmt.Println(reflect.TypeOf(100)) // int
>
>
> and an "int32" type value takes "4" bytes.
>
> var num int32
>> fmt.Println(unsafe.Sizeof(num)) // 4
>
>
> So in this case below, Is the memory usage "12" bytes in total? (Question
> 1)
>
> var num int32 = 100
>> | |
>> 4 bytes + 8 bytes = 12 bytes
>
>
> and in this case below, Is the memory usage "16" bytes in total? (Question
> 2)
> because the integer constant "100" is "8" bytes first then it's converted
> to "int32" which is "4" bytes.
>
> var num int32 = int32(100)
>> | | |
>> 4 bytes + 4 bytes + 8 bytes = 16 bytes
>
>
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