gopl-zh.github.com/vendor/gopl.io/ch5/sum/main.go

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// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
// See page 142.
// The sum program demonstrates a variadic function.
package main
import "fmt"
//!+
func sum(vals ...int) int {
total := 0
for _, val := range vals {
total += val
}
return total
}
//!-
func main() {
//!+main
fmt.Println(sum()) // "0"
fmt.Println(sum(3)) // "3"
fmt.Println(sum(1, 2, 3, 4)) // "10"
//!-main
//!+slice
values := []int{1, 2, 3, 4}
fmt.Println(sum(values...)) // "10"
//!-slice
}