Go Languages basic grammar

The last chapter we already know the basic structures of the Go language, in this chapter we will learn basic grammar Go language.

Go mark

Go program may be composed of a plurality of marks, it may be keywords, identifiers, constants, a string, a symbol. As the GO statement tag consists of six components:

fmt.Println("Hello, World!")

6 is a flag (one per line):

1. fmt
2. .
3. Println
4. (
5. "Hello, World!"
6. )

Line separator

In the Go program, a statement on behalf of his party ended. Each statement is not like the other C family of languages with a semicolon; at the end, because these jobs are done automatically by the compiler Go.

If you intend to write multiple statements on the same line, they must be used; artificial distinction, but in the actual development, we do not encourage this practice.

The following two statements:

fmt.Println("Hello, World!")
fmt.Println("CodingDictCodingDict教程：CodingDict.com")

Note

Comments are not compiled, each package should have a relevant comment.

Single-line comments are the most common form of comments, you can use single-line comments begin with // anywhere. Multi-line comments, also called block comments at the beginning have been to / *, and to *end with a /. Such as:

// 单行注释
/*
 Author by CodingDictCodingDict教程
 我是多行注释
 */

Identifier

Identifier is used to named variables, like the type of program entities. An identifier is actually a letter or a plurality of (A ~ Z and a ~ z) numbers (0 to 9), _ underlined sequence consisting of, but the first character must be a letter huo underlined number is not.

The following are valid identifiers:

mahesh   kumar   abc   move_name   a_123
myname50   _temp   j   a23b9   retVal

The following are invalid identifiers:

1ab (start with a number)
case (keyword Go language)
a + b (the operator is not allowed)

Keyword

Here are the Go will use to 25 keywords or reserved words:

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

In addition to the above description of these keywords, Go language there are 36 predefined identifiers:

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

Program typically consists of the keyword, constants, variables, operators, type, and functions.

May be used to program these delimiters: parentheses (), brackets [] and braces {}.

The program may use these punctuation marks: ,,,;,: and ....

Go Language spaces

Go declaration of variables in the language must be separated by a space, such as:

var age int;

Statement to make appropriate use of the space program look easy to read.
No spaces:

fruit=apples+oranges;

Include spaces between variables and operators, the program looks more beautiful, such as:

fruit = apples + oranges;

This switched: http://codingdict.com/article/6748