This topic is well explained in the blog post at blog.golang.org/constants, if I do say so myself.
-rob On Thu, Jan 28, 2021 at 4:45 PM Arunkumar Gudelli < arunkumar.gude...@gmail.com> wrote: > 256 considered as `constant`. (untyped) > So when we try to convert to byte (which has a range from 0 to 255), it > will throw the overflow error. > > Where `x := uint64(256)` we are giving a type to constant uint64. > > y := byte(256) // Same error > > so byte(uint64) will be zero without any errors. > > regards, > Arun Gudelli > https://golangtutorial.dev/ > > On Thu, Jan 28, 2021 at 6:43 AM Barry Li <barrya...@gmail.com> wrote: > >> Some doubts about type conversion in go. >> In the following code, why can it be executed normally after passing the >> variable? >> The code is an error during the compilation phase. >> >> // The following two lines of code can be executed normally >> x := uint64(256) >> fmt.Println(byte(uint64(x))) // normal execution >> >> // The following code cannot be executed normally >> fmt.Println(byte(uint64(256))) // constant 256 overflows byte >> >> Can anyone help me answer it? >> >> -- >> 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/401197ca-1cdc-45e8-9135-bafe0a300e21n%40googlegroups.com >> <https://groups.google.com/d/msgid/golang-nuts/401197ca-1cdc-45e8-9135-bafe0a300e21n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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/CAOOGzbXe84WeaN2rE7POow5gs_T5JikJfH9Vh8_EruEK_C3bKw%40mail.gmail.com > <https://groups.google.com/d/msgid/golang-nuts/CAOOGzbXe84WeaN2rE7POow5gs_T5JikJfH9Vh8_EruEK_C3bKw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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/CAOXNBZTMUwkKaHWRWT%2Bku1iGo-j9DdrGWJNMOmDS9_utD_w0Bg%40mail.gmail.com.
