1 // run 2 3 // Copyright 2009 The Go Authors. All rights reserved. 4 // Use of this source code is governed by a BSD-style 5 // license that can be found in the LICENSE file. 6 7 // Test simultaneous assignment. 8 9 package main 10 11 var a, b, c, d, e, f, g, h, i int 12 13 func printit() { 14 println(a, b, c, d, e, f, g, h, i) 15 } 16 17 func testit(permuteok bool) bool { 18 if a+b+c+d+e+f+g+h+i != 45 { 19 print("sum does not add to 45\n") 20 printit() 21 return false 22 } 23 return permuteok || 24 a == 1 && 25 b == 2 && 26 c == 3 && 27 d == 4 && 28 e == 5 && 29 f == 6 && 30 g == 7 && 31 h == 8 && 32 i == 9 33 } 34 35 func swap(x, y int) (u, v int) { 36 return y, x 37 } 38 39 func main() { 40 a = 1 41 b = 2 42 c = 3 43 d = 4 44 e = 5 45 f = 6 46 g = 7 47 h = 8 48 i = 9 49 50 if !testit(false) { 51 panic("init val\n") 52 } 53 54 for z := 0; z < 100; z++ { 55 a, b, c, d, e, f, g, h, i = b, c, d, a, i, e, f, g, h 56 57 if !testit(z%20 != 19) { 58 print("on ", z, "th iteration\n") 59 printit() 60 panic("fail") 61 } 62 } 63 64 if !testit(false) { 65 print("final val\n") 66 printit() 67 panic("fail") 68 } 69 70 a, b = swap(1, 2) 71 if a != 2 || b != 1 { 72 panic("bad swap") 73 } 74 75 a, b = swap(swap(a, b)) 76 if a != 2 || b != 1 { 77 panic("bad swap") 78 } 79 } 80
