Go programming language – Basics

Variable declaration/initialization

// Three ways to declare (initialize) a single variable
//1
var name string = "hello world" 
// omit the type and initialize it
var name = "hello world" 
//3. Declare and initialize with the := symbol, but only inside functions
name := "hello world"

// Two ways to declare (initialize) a single pointer
//1, use &< variable name > to fetch the memory address of the variable
var age int = 10
var ptr = &age 
// use the expression new(Type)
ptr := new(int)

// Two ways to declare (initialize) multiple variables
//1. Multiple variables are declared together
var (
    name string
    age int
    gender string
)
Declare and initialize multiple variables
name, age := "hello".10

// Anonymous variables, which act as placeholders, are usually represented by underscores
// Anonymous variables do not allocate memory, do not occupy memory space, and can be declared multiple times
func GetPoint(a) (int.int) {
    return 100.200
}
func main(a){
    x, _ := GetPoint()
    _, y := GetPoint()
    fmt.Println(x, y)
}
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2. Variable types