Go Language (ii): basic knowledge

This is a creation in Article, where the information may have evolved or changed.

A. Variable
Variable declaration

varintvarboolvarstring

Declaration + Assignment

varint15var5varboolfalse

Value types and reference types:
In go, the basic types of int, float, bool, and string all belong to the value type;
pointers, slices,maps and channel belong to reference types;

Definition Format for constants: const identifier [Type] = value
Const PI = 3.14159 When no type is specified, the constant infers the type it needs according to its usage environment.