英文:
Why does typecasting a single byte to string not work in go?
问题
我正在尝试将一个单字节值转换为字符串在golang中。当我将一个字节类型转换为字符串，例如string(byte)并打印值时，我得到的响应是"{\""。我阅读了其他答案，正确的将字节转换为字符串的方法应该是strconv.Itoa(int(bytevalue))。为什么前者不起作用，而后者的方法是正确的呢？
英文:
I am trying to convert a single byte value to a string in golang. When I do a typecast of a byte to string like string(byte) and print the value I get "{" in response. I read other answers that the correct way to convert a byte to string would be strconv.Itoa(int(bytevalue)). Why does the former not work and why is the latter approach correct.
答案1
得分: 2
表达式string(bytevalue)是一种转换，而不是类型转换。
规范中对于从数值类型到字符串的转换有如下说明：
将有符号或无符号整数值转换为字符串类型会产生一个包含整数的UTF-8表示的字符串。
表达式string(byte(123))的结果是字符串"{"，因为{是表示符文123的UTF-8表示的字符串。
使用strconv包来获取字节的十进制表示。表达式strconv.Itoa(int(byte(123)))的结果是字符串"123"。
英文:
The expression string(bytevalue) is a conversion, not a typecast.
The specification says this about conversions from numeric types to a string:
> Converting a signed or unsigned integer value to a string type yields a string containing the UTF-8 representation of the integer.
The expression string(byte(123)) evaluates to the string "{" because { is the the string containing the UTF-8 representation of the rune 123.
Use the strconv package to get the decimal representation of the byte. The expression strconv.Itoa(int(byte(123))) evaluates to the string "123".
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