2022-07-24: what is the output of the following go language code? A：[]int{}； B：[]int(nil)； C：panic； D: Compilation error. package main import ( “fmt“ ) f

2022-07-24： following go What language code outputs ？A：[]int{};B：[]int(nil);C：panic;D： Compile error .

package main

import (
    "fmt"
)

func f(a ...int) {
    
    fmt.Printf("%#v\n", a)
}

func main() {
    
    f()
}

Answer selection B, But there is 58% Selected by the user of A. First ,a The type is []int, call f when , No parameters passed , So the equivalent value is nil, namely a The type is []int, The value is nil. and fmt.Printf It's a simple verb %#v Type and value will be printed at the same time . So the result is B.