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How to understand the constants in Go? in view of this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

Constant

Constants are values that cannot be changed when the program is running, constants must be initialized, constants can be defined as types, and Go supports characters, strings, Boolean and numeric values as constants. The compiler can also do type inference by initializing values with constants.

⚠️ Note:

A constant is defined in a function code block, which is not used and there is no compilation error.

Go can define constants as well as variables. There is no reserved word for constants in Python.

The keyword const is used to declare constants in Go, which is the same in other languages, such as js,c#.

The best way to understand this is to change the keyword var that defines variables in the previous section to const.

Code sample package main

Import "fmt"

Const name = "zhangsan"

/ / the form of constant group

Const (

X = 11

Y / / No constant type and initialization value are specified in the constant group, which is the same as the constant value in the previous row that is not empty.

Z

)

Func main () {

Const a = 1

Const b = "hehe" / / and define the difference between variables that can not be used.

/ / const name / / must be initialized

Const c, d = 3, 5 / / also supports multiple constant assignments

Const (

X1 = 11

Y1 / / No constant type and initialization value are specified in the constant group, which will be the same as the constant value in the previous row that is not empty.

Z1

)

Fmt.Println (x, y, z)

Fmt.Println (a)

Fmt.Println (c, d)

}

Supplement

In the definition of variables in the previous section, forgot to mention the variable group, in fact, it is similar to the above code constant group, the keyword const can be changed to var. For example

Var (

A = 11

B = 12

Censor 13

)

Note 1: after each line of variable declaration assignment, there is no comma.

Note 2: variables must be assigned values.

Note 3: it is defined that it must be used, otherwise the compiler reports an error.

What go is suitable for go is the abbreviation of golang, while golang can do server-side development, and golang is very suitable for log processing, data packaging, virtual machine processing, database agent and other work. In the aspect of network programming, it is also widely used in web applications, API applications and other fields.

This is the answer to the question about how to understand the constants in Go. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel to learn more about it.

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