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https://github.com/golang/go
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79 lines
1.1 KiB
Go
79 lines
1.1 KiB
Go
// run
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test simultaneous assignment.
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package main
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var a, b, c, d, e, f, g, h, i int
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func printit() {
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println(a, b, c, d, e, f, g, h, i)
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}
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func testit(permuteok bool) bool {
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if a+b+c+d+e+f+g+h+i != 45 {
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print("sum does not add to 45\n")
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printit()
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return false
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}
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return permuteok ||
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a == 1 &&
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b == 2 &&
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c == 3 &&
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d == 4 &&
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e == 5 &&
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f == 6 &&
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g == 7 &&
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h == 8 &&
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i == 9
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}
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func swap(x, y int) (u, v int) {
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return y, x
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}
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func main() {
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a = 1
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b = 2
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c = 3
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d = 4
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e = 5
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f = 6
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g = 7
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h = 8
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i = 9
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if !testit(false) {
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panic("init val\n")
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}
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for z := 0; z < 100; z++ {
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a, b, c, d, e, f, g, h, i = b, c, d, a, i, e, f, g, h
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if !testit(z%20 != 19) {
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print("on ", z, "th iteration\n")
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printit()
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panic("fail")
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}
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}
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if !testit(false) {
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print("final val\n")
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printit()
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panic("fail")
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}
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a, b = swap(1, 2)
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if a != 2 || b != 1 {
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panic("bad swap")
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}
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a, b = swap(swap(a, b))
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if a != 2 || b != 1 {
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panic("bad swap")
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}
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}
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