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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")
}
}