40 lines
807 B
Text
40 lines
807 B
Text
var bit = [var _ = 1];
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for (var i = 1; i < 32; i += 1)
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append(bit, _ += _);
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# returns number <n> as bit string: bits.string(6) -> "110"
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var string = func(n) {
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if (!n)
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return '0';
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var s = "";
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while (n) {
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s = ((var v = int(n / 2)) + v != n) ~ s;
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n = v;
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}
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return s;
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}
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# checks whether bit <b> is set in number <n>
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var test = func(n, b) {
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n /= bit[b];
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return int(n) != int(n / 2) * 2;
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}
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# returns number <n> with bit <b> set
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var set = func(n, b) test(n, b) ? n : n + bit[b];
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# returns number <n> with bit <b> cleared
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var clear = func(n, b) test(n, b) ? n - bit[b] : n;
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# returns number <n> with bit <b> toggled
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var toggle = func(n, b) test(n, b) ? n - bit[b] : n + bit[b];
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# returns number <n> with bit <b> set to value <v>
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var switch = func(n, b, v) n - (test(n, b) - !!v) * bit[b];
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