Go Language Basics

Go tag

The Go program can consist of multiple tags, which can be keywords, identifiers, constants, strings, and symbols. The following GO statement consists of 6 tokens:

FMT.  Println("Hello, world!" )

6 tokens are (one per line):

1 . FMT 2 . . 3 . Println4. (5"Hello, world! " 6.)

Row delimiter

In the Go program, a line represents the end of a statement. Each statement does not need to be semicolon-like other languages in the C family; End, because all of this work will be done automatically by the Go compiler.

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

The following are two statements:

Fmt. Println ("Hello, world! " ) fmt. Println ("666666666666666666")

Comments

Comments are not compiled, and each package should have related comments.

Single-line comments are the most common form of annotation, and you can use a single-line comment at any point, starting with//. Multiline comments are also called block annotations, which begin with/* and end with */. Such as:

// single-line comment /* */

Identifier

Identifiers are used to name program entities such as variables, types, and so on. An identifier is actually a sequence of one or more letters (A~Z and A~z) numbers (0~9) and underscores _, but the first character must be a letter or an underscore and not a number.

The following are valid identifiers:

MAHESH  KUMAR  ABC  move_name a_123myname50  _temp  J  a23b9 RetVal

The following are invalid identifiers:

1ab (starting with a number)  Case (keywords for Go language) a+b (operator is not allowed)

Key words

Here are the 25 keywords or reserved words that will be used in the Go code:

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

In addition to the keywords described above, the Go language also has 36 predefined identifiers:

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

Programs are typically made up of keywords, constants, variables, operators, types, and functions.

These delimiters may be used in the program: parentheses (), brackets [], and curly braces {}.

These punctuation marks may be used in the program:. 、,、;,: And ....

The space of the Go language

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

var int;

The proper use of spaces in a statement can make the program read easily.

No spaces:

Fruit=apples+oranges;

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

GOFMT format code can be used in Go tools

Go Language Basics