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// $G $D/$F.go && $L $F.$A && ./$A.out
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
func sum(args ...int) int {
s := 0
for _, v := range args {
s += v
}
return s
}
func sumA(args []int) int {
s := 0
for _, v := range args {
s += v
}
return s
}
func sum2(args ...int) int { return 2 * sum(args) }
func sum3(args ...int) int { return 3 * sumA(args) }
func intersum(args ...interface{}) int {
s := 0
for _, v := range args {
s += v.(int)
}
return s
}
type T []T
func ln(args ...T) int { return len(args) }
func ln2(args ...T) int { return 2 * ln(args) }
func main() {
if x := sum(1, 2, 3); x != 6 {
panicln("sum 6", x)
}
if x := sum(); x != 0 {
panicln("sum 0", x)
}
if x := sum(10); x != 10 {
panicln("sum 10", x)
}
if x := sum(1, 8); x != 9 {
panicln("sum 9", x)
}
if x := sum2(1, 2, 3); x != 2*6 {
panicln("sum 6", x)
}
if x := sum2(); x != 2*0 {
panicln("sum 0", x)
}
if x := sum2(10); x != 2*10 {
panicln("sum 10", x)
}
if x := sum2(1, 8); x != 2*9 {
panicln("sum 9", x)
}
if x := sum3(1, 2, 3); x != 3*6 {
panicln("sum 6", x)
}
if x := sum3(); x != 3*0 {
panicln("sum 0", x)
}
if x := sum3(10); x != 3*10 {
panicln("sum 10", x)
}
if x := sum3(1, 8); x != 3*9 {
panicln("sum 9", x)
}
if x := intersum(1, 2, 3); x != 6 {
panicln("intersum 6", x)
}
if x := intersum(); x != 0 {
panicln("intersum 0", x)
}
if x := intersum(10); x != 10 {
panicln("intersum 10", x)
}
if x := intersum(1, 8); x != 9 {
panicln("intersum 9", x)
}
if x := ln(nil, nil, nil); x != 3 {
panicln("ln 3", x)
}
if x := ln([]T{}); x != 1 {
panicln("ln 1", x)
}
if x := ln2(nil, nil, nil); x != 2*3 {
panicln("ln2 3", x)
}
if x := ln2([]T{}); x != 2*1 {
panicln("ln2 1", x)
}
}
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