go语言基础之append函数的使用

1、append函数的使用

作用：在原切片的末尾添加元素

示例：

package main //必须有个main包

import "fmt"

func main() {
        s1 := []int{}
        fmt.Printf("len = %d, cap = %d\n", len(s1), cap(s1))
        fmt.Println("s1 = ", s1)

        //在原切片的末尾添加元素
        s1 = append(s1, 1)
        s1 = append(s1, 2)
        s1 = append(s1, 3)
        fmt.Printf("len = %d, cap = %d\n", len(s1), cap(s1))
        fmt.Println("s1 = ", s1)

        s2 := []int{1, 2, 3}
        fmt.Println("s2 = ", s2)
        s2 = append(s2, 5)
        s2 = append(s2, 5)
        s2 = append(s2, 5)
        fmt.Println("s2 = ", s2)
}

#执行结果：

len = 0, cap = 0
s1 =  []
len = 3, cap = 4
s1 =  [1 2 3]

s2 =  [1 2 3]
s2 =  [1 2 3 5 5 5]