Basic data types in golang

Note: matters needing attention

1. Get the length of the object built in len() The length returned by the function can vary according to the byte length of different platforms .
2. In practice , Slice or map The number of elements can be used int To express . When it comes to binary transmission 、 When reading and writing the structure description of a file , In order to keep the structure of the file unaffected by the byte length of different compiled target platforms , Do not use int and uint.
3. Go Casting integers to Booleans... Is not allowed in the language .
4. Boolean cannot participate in numeric operations , It can't be converted with other types .
5. Go There are only casts in the language , There is no implicit type conversion . This syntax can only be used when mutual conversion is supported between two types .
6. stay Go in , The essence of a character is an integer , When output directly , Is the character corresponding to UTF-8 The code value of the code .