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 ", 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 ", 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：

1 2 3 4 5 6 7

len = 0, cap = 0 s1 =  [] len = 3, cap = 4 s1 =  [1 2 3]   s2 =  [1 2 3] s2 =  [1 2 3 5 5 5]