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https://github.com/golang/go
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123 lines
1.6 KiB
Go
123 lines
1.6 KiB
Go
// run
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Test iota.
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package main
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func assert(cond bool, msg string) {
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if !cond {
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print("assertion fail: ", msg, "\n")
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panic(1)
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}
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}
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const (
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x int = iota
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y = iota
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z = 1 << iota
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f float32 = 2 * iota
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g float32 = 4.5 * float32(iota)
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)
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const (
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X = 0
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Y
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Z
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)
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const (
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A = 1 << iota
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B
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C
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D
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E = iota * iota
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F
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G
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)
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const (
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a = 1
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b = iota << a
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c = iota << b
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d
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)
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const (
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i = (a << iota) + (b * iota)
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j
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k
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l
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)
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const (
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m = iota == 0
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n
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)
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const (
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p = float32(iota)
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q
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r
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)
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const (
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s = string(iota + 'a')
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t
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)
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const (
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abit, amask = 1 << iota, 1<<iota - 1
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bbit, bmask = 1 << iota, 1<<iota - 1
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cbit, cmask = 1 << iota, 1<<iota - 1
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)
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func main() {
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assert(x == 0, "x")
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assert(y == 1, "y")
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assert(z == 4, "z")
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assert(f == 6.0, "f")
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assert(g == 18.0, "g")
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assert(X == 0, "X")
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assert(Y == 0, "Y")
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assert(Z == 0, "Z")
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assert(A == 1, "A")
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assert(B == 2, "B")
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assert(C == 4, "C")
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assert(D == 8, "D")
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assert(E == 16, "E")
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assert(F == 25, "F")
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assert(a == 1, "a")
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assert(b == 2, "b")
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assert(c == 8, "c")
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assert(d == 12, "d")
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assert(i == 1, "i")
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assert(j == 4, "j")
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assert(k == 8, "k")
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assert(l == 14, "l")
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assert(m, "m")
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assert(!n, "n")
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assert(p == 0.0, "p")
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assert(q == 1.0, "q")
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assert(r == 2.0, "r")
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assert(s == "a", "s")
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assert(t == "b", "t")
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assert(abit == 1, "abit")
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assert(amask == 0, "amask")
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assert(bbit == 2, "bbit")
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assert(bmask == 1, "bmask")
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assert(cbit == 4, "cbit")
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assert(cmask == 3, "cmask")
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}
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