How to declare and assign variables correctly in Go language

How to correctly declare and assign variables in Go language

Go language is a statically typed programming language, and variables must be declared before use. In the Go language, the syntax for variable declaration is: var variable name variable type.

1. Declaring variables
   When declaring variables in the Go language, you can use the keyword var or :=, depending on whether the variable is a global variable or a local variable.

Global variables are declared as follows:

var globalVar int

Local variables are declared as follows:

func main() {
    var localVar int
}

2. Declare and assign variables
   In Go language, you can also declare and assign variables with the following syntax:

   var a int = 10

If the type of the variable can be inferred, you can also use := to declare and assign variables:

b := 20

1. Explicit declaration and assignment

   var c int
   c = 30

2. Multiple variable declaration
   In the Go language, multiple variables can be declared at the same time, and To assign values ​​to them, the syntax is as follows:

   var d, e int = 40, 50

You can also use := to declare multiple variables and assign values ​​at the same time:

f, g := 60, 70

4. Global Initialization of variables
   When declaring a global variable, if you want to initialize a variable, you can use the init function, as shown below:

   var globalVar int
   
   func init() {
    globalVar = 80
   }

5. Declaration and assignment of constants
   In Go In the language, constants are declared using the const keyword. Constants must be assigned a value when declared and are not allowed to be assigned again. Example:

   const pi = 3.14159

6. Anonymous variable
   In the Go language, _ is used to represent an anonymous variable, which is used to ignore a return value or unnecessary variables. Example:

   _, result := divide(10, 2)

   Summary:
   In the Go language, correct declaration and assignment of variables is the basis for writing programs. Correct variable declaration can improve the readability and robustness of the program. Through the introduction of this article, readers can learn how to correctly declare and assign variables in the Go language, and master the skills of using different variable declaration and assignment methods. I hope readers can deepen their understanding of Go language variable declaration and assignment through practical operations.

   [Note] The code examples are for reference only, please use them flexibly according to the actual situation.

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