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 // \$G \$F.go && \$L \$F.\$A && ./\$A.out // 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. 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") } }