Go --- identifiers and keywords in go language

One 、 identifier

1.1 Identifier introduction

The English of the identifier is identifier, Generally speaking , Is to give variables 、 Constant 、 function 、 Method 、 Structure 、 Array 、 section 、 Interface name .

1.2 The composition of the identifier

• Identifier by number 、 Letters and underscores (_) form .123 abc _

• Only letters and underscores (_) start .abc123 _sysVar 123abc

• Identifiers are case sensitive . name Name NAME

1.3 Give an example to illustrate the naming of identifiers

Correct naming

package main

import "fmt"

func main() {
    
	var name string
	var age int
	var _sys int
}

Bad identifier

package main

import "fmt"

func main() {
    
	var 1name string
	var &age int
	var !email
}

Two 、go Language keywords

2.1 go Language provides 25 Key words , As shown below .

break	default	func	interface	select
case	defer	go	map	struct
chan	else	goto	package	switch
const	fallthrough	if	range	type
continue	for	import	return	var

2.2 Go Language and 36 Predefined identifiers

It contains the name of the basic type and some basic built-in functions , See the table below ：

append	bool	byte	cap	close	complex	complex64	complex128	uint16
copy	false	float32	float64	imag	int	int8	int16	uint32
int32	int64	iota	len	make	new	nil	panic	uint64
print	println	real	recover	string	true	uint	uint8	uintptr