June 22, 2022: golang multiple choice question, what does the following golang code output? A：3； B：1； C：4； D: Compilation failed.

2022-06-22：golang choice question , following golang What does the code output ？A：3;B：1;C：4;D： Compile failed .

package main

import (
    "fmt"
)

func main() {
    var nums1 []interface{}
    nums2 := []int{1, 3, 4}
    nums3 := append(nums1, nums2...)
    fmt.Println(len(nums3))
}

Copy

answer 2022-06-22：

Answer selection D. Compiler error cannot use nums2 (type []int) as type []interface {} in append.int Belong to interface{},[]int Do not belong to []interface{}. Son belongs to Lao Tzu , Sons do not belong to Lao Tzu .

Insert picture description here