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| // run
|
| // Copyright 2009 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.
|
| // Test simultaneous assignment.
|
| package main
|
| var a, b, c, d, e, f, g, h, i int
|
| func printit() {
| println(a, b, c, d, e, f, g, h, i)
| }
|
| func testit(permuteok bool) bool {
| if a+b+c+d+e+f+g+h+i != 45 {
| print("sum does not add to 45\n")
| printit()
| return false
| }
| return permuteok ||
| a == 1 &&
| b == 2 &&
| c == 3 &&
| d == 4 &&
| e == 5 &&
| f == 6 &&
| g == 7 &&
| h == 8 &&
| i == 9
| }
|
| func swap(x, y int) (u, v int) {
| return y, x
| }
|
| func main() {
| a = 1
| b = 2
| c = 3
| d = 4
| e = 5
| f = 6
| g = 7
| h = 8
| i = 9
|
| if !testit(false) {
| panic("init val\n")
| }
|
| for z := 0; z < 100; z++ {
| a, b, c, d, e, f, g, h, i = b, c, d, a, i, e, f, g, h
|
| if !testit(z%20 != 19) {
| print("on ", z, "th iteration\n")
| printit()
| panic("fail")
| }
| }
|
| if !testit(false) {
| print("final val\n")
| printit()
| panic("fail")
| }
|
| a, b = swap(1, 2)
| if a != 2 || b != 1 {
| panic("bad swap")
| }
|
| a, b = swap(swap(a, b))
| if a != 2 || b != 1 {
| panic("bad swap")
| }
| }
|
|
