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