Go语言学习之函数的定义与使用详解

func min(num1, num2 int) int {
    if num1 <= num2 {
        return num1
    } else {
        return num2
    }
}
 
func main() {
    fmt.Printf("max = %d\n", min(10, 12))
}

func swap(num1, num2 int) (int, string) {
    return num1 + num2, "haha"
}
 
func main() {
    a, b := swap(10, 12)
    fmt.Printf("swap = %d - %v\n", a, b)
}

func swap1(num1, num2 *int) {
    var temp int
    temp = *num1
    *num1 = *num2
    *num2 = temp
}
 
 
func main() {
    c, d := 10, 20
    swap1(&c, &d)
    fmt.Printf("swap1 c=%d,d=%d\n", c, d)
}

func method(num1 int) int {
    getMax := func(x, y int) int {
        if x > y {
            return x
        } else {
            return y
        }
    }
    a := num1 - 10
    b := getMax(num1, a)
    fmt.Printf("value = %d\n", b)
    return b
}
 
func main() {
    fmt.Printf("method = %d\n", method(20))
}

//匿名函数
func anonymous(num int) func() int {
    var a int
    a = num
    return func() int {
        a += 1
        return a
    }
 
}
 
func main() {
    flagNum := anonymous(100)
    fmt.Printf("1 -> %d\n", flagNum())
    fmt.Printf("2 -> %d\n", flagNum())
    fmt.Printf("3 -> %d\n", flagNum())
    flagNum1 := anonymous(18)
    fmt.Printf("4 -> %d\n", flagNum1())
    fmt.Printf("5 -> %d\n", flagNum1())
}