1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
// $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")
}
}
|
