OK, I understand it somehow but I want to make sure my understanding is correct.
There are two types of constant "untyped constant" and "typed constant". 1. An untyped constant has a size but it's not specific which means an untyped constant takes some memory. > fmt.Println(100) 2. A typed constant has a specific size which means a typed constant takes a specific amount of memory. > fmt.Println(int(100)) Is my understanding correct? 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 > > -- 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. For more options, visit https://groups.google.com/d/optout.
