Golang Study Note one: Language specification

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

Introduction

Golang Reference Manual For more information, please refer to http://golang.org
Language Specification reference from Https://golang.org/ref/spec

Lexical elements

Comments

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Symbol

There are 4 types of symbols: identifiers, keywords, operators and separators, literal constants

Semicolon

Golang, semicolons can be omitted

Identifier

Identifiers are variables and types in a program, with one or more letters or numbers, and the first letter must begin with a letter.

identifier = letter { letter | unicode_digit }

Key words

Identifier cannot be a reserved keyword in Golang

 Break        default      func         Interface    Select Case         defer        Go           Map          structChan         Else         Goto          Package      SwitchConst        Fallthrough  if           Range        typeContinue      for          Import       return       var

Operators and separators

The operators, separators, and other special symbols in the Golang as shown below

+    &     +=    &=     &&    ==    !=    (    )-    |     -=    |=     ||    <     <=    [    ]*    ^     *=    ^=     <-    >     >=    {    }/    <<    /=    <<=    ++    =     :=    ,    ;%    >>    %=    >>=    --    !     ...   .    :     &^          &^=

Shaping literal

Shaping literals are shaped constants represented by a sequence of numbers, which can be prefixed by 0 or 0x, representing 8 binary and 16 binary numbers, respectively.

int_lit     "1""9"{ decimal_digit } .octal_lit   "0"{ octal_digit } .hex_lit     "0""x""X"{ hex_digit } .4206000xBadFace170141183460469231731687303715884105727

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