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