如何修复Go中的“常量x oveflows字节”错误？

Question

Hello I am trying to make a byte slice with constants but I get the constant x overflows byte error. Here are my constants:

const(
     Starttrame1 = 0x10A
     Starttrame2 = 0x10B
     Starttrame3 = 0X10C
     Starttrame4 = 0X10D
     Starttrame5 = 0X10E
     Starttrame6 = 0x10F
)

and here is how I declare my slice:

var startValues = [6]byte{Starttrame1,Starttrame2,Startrame3,Starttrame4,Starttrame5,Starttrame6}

Everytime I build I get the constant 266 overflows byte. How should I declare my constants in order to fix this?

Answer 1

In Go, byte is an alias for uint8, which is the set of all unsigned 8-bit integers (0..255, both inclusive), see Spec: Numeric types. Which means a value of 0x10A = 266 cannot be stored in a value of type byte.

If you need to store those constants, use a different type, e.g. uint16:

const (
    Starttrame1 = 0x10A
    Starttrame2 = 0x10B
    Starttrame3 = 0X10C
    Starttrame4 = 0X10D
    Starttrame5 = 0X10E
    Starttrame6 = 0x10F
)

var data = [...]uint16{
    Starttrame1, Starttrame2, Starttrame3, Starttrame4, Starttrame5, Starttrame6,
}

Try it on the Go Playground.