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 iota. 8 9 package main 10 11 func assert(cond bool, msg string) { 12 if !cond { 13 print("assertion fail: ", msg, "\n") 14 panic(1) 15 } 16 } 17 18 const ( 19 x int = iota 20 y = iota 21 z = 1 << iota 22 f float32 = 2 * iota 23 g float32 = 4.5 * float32(iota) 24 ) 25 26 const ( 27 X = 0 28 Y 29 Z 30 ) 31 32 const ( 33 A = 1 << iota 34 B 35 C 36 D 37 E = iota * iota 38 F 39 G 40 ) 41 42 const ( 43 a = 1 44 b = iota << a 45 c = iota << b 46 d 47 ) 48 49 const ( 50 i = (a << iota) + (b * iota) 51 j 52 k 53 l 54 ) 55 56 const ( 57 m = iota == 0 58 n 59 ) 60 61 const ( 62 p = float32(iota) 63 q 64 r 65 ) 66 67 const ( 68 s = string(iota + 'a') 69 t 70 ) 71 72 const ( 73 abit, amask = 1 << iota, 1<<iota - 1 74 bbit, bmask = 1 << iota, 1<<iota - 1 75 cbit, cmask = 1 << iota, 1<<iota - 1 76 ) 77 78 func main() { 79 assert(x == 0, "x") 80 assert(y == 1, "y") 81 assert(z == 4, "z") 82 assert(f == 6.0, "f") 83 assert(g == 18.0, "g") 84 85 assert(X == 0, "X") 86 assert(Y == 0, "Y") 87 assert(Z == 0, "Z") 88 89 assert(A == 1, "A") 90 assert(B == 2, "B") 91 assert(C == 4, "C") 92 assert(D == 8, "D") 93 assert(E == 16, "E") 94 assert(F == 25, "F") 95 96 assert(a == 1, "a") 97 assert(b == 2, "b") 98 assert(c == 8, "c") 99 assert(d == 12, "d") 100 101 assert(i == 1, "i") 102 assert(j == 4, "j") 103 assert(k == 8, "k") 104 assert(l == 14, "l") 105 106 assert(m, "m") 107 assert(!n, "n") 108 109 assert(p == 0.0, "p") 110 assert(q == 1.0, "q") 111 assert(r == 2.0, "r") 112 113 assert(s == "a", "s") 114 assert(t == "b", "t") 115 116 assert(abit == 1, "abit") 117 assert(amask == 0, "amask") 118 assert(bbit == 2, "bbit") 119 assert(bmask == 1, "bmask") 120 assert(cbit == 4, "cbit") 121 assert(cmask == 3, "cmask") 122 } 123
