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This article introduces the knowledge of "sample Analysis of basic types and constant usage of Go language". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Overview

In the Go programming language, data types are used to declare functions and variables. The emergence of data types in order to divide the data into the need to use big data need to apply for large memory, so that the column can fully use memory.

There are several data types by category: numeric types

Boolean type

Bool: Boolean values can only be constant true or false, and the default value is false.

String type

String: the encoding is unified as the UTF-8 encoding identification Unicode text, and the default value is an empty string.

Integer (default is 0)

Uint8: unsigned 8-bit integers (0-255)

Uint16: unsigned 16-bit integer (0 ~ 65535)

Uint32: unsigned 32-bit integer (0 ~ 4294967295)

Uint64: unsigned 64-bit integer (0 ~ 18446744073709551615)

Int8: signed 8 bit integer (- 128127)

Int16: signed 16-bit integer (- 32768 ~ 32767)

Int32: signed 32-bit integer (- 2147483648 ~ 2147483647)

Int64: signed 64-bit integer (- 9223372036854775808 ~ 9223372036854775807)

Floating point (default is 0)

Float32:IEEE-754 32-bit floating point number

Float64:IEEE-754 64-bit floating point number

Complex64:32 bit real number and imaginary number

Complex128:64 bit real number and imaginary number

Other numerical types

Byte: similar to uint8

Rune: similar to int32

Uint:32 or 64-bit

Int: same size as uint

Uintptr: unsigned integer, used to store a pointer

Derived type pointer type (Pointer)

Array type

Structured types (struct)

Channel type (chan)

Function type (func)

Slice Type (slice)

Interface type (interface)

Overview of Map type (map) variables

A constant is a constant value relative to a variable and cannot be modified again, such as pi.

A single variable declares const pi = 3.141592const e = 2.718281

The declaration of a constant is very similar to that of a variable, except that var is replaced with const.

Multiple variables declare const (pi = 3.141592 e = 2.718281)

Constants can be used for array declarations because they are determined at compile time

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