How to define variables in golang

How to define variables in golang: 1. Declare the variable and assign the initial value "var age int = value"; 2. Declare the variable but do not assign the initial value "var age int"; 3. Use short variable declaration " age := value"; 4. For variables of array, slice, map and function types "var numbers []int = value" or "numbers := value". It should be noted that variable names in the Go language follow the camel case naming method, with the first letter in lowercase representing private variables and the first letter in uppercase representing public variables.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

In Go language, defining variables is very simple. The following are some common methods:

1. Declare a variable and assign an initial value:

var variableName type = initialValue

For example, declare a variable of integer type and assign a value of 10:

var age int = 10

2. Declare a variable but do not assign an initial value:

var variableName type

For example, declare an integer type variable but do not assign a value:

var age int

In this case In this case, the value of the variable is undefined (i.e. not initialized), so it should be assigned an initial value before use.

3. Use short variable declaration (recommended):

variableName := initialValue

For example, declare a variable of integer type and assign a value of 10:

age := 10

This This short variable declaration method can omit the type declaration of the variable, and the compiler will automatically infer the variable type. This makes the code more concise and readable.

4. For variables of array, slice, map and function types, you can declare them in the following way:

var variableName type = initialValue

For example, declare a slice of integer type and assign the value as []int{1, 2, 3}:

var numbers []int = []int{1, 2, 3}

Or use the short variable declaration method:

numbers := []int{1, 2, 3}

These are the basic methods of defining variables. It should be noted that variable names in the Go language follow the camel case naming method, that is, the first letter in lowercase represents private variables, and the first letter in uppercase represents public variables.

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