c# - Last two bits in a BitArray of length 4 are being ignored when converting to int -


consider following bitarray:

bitarray bitarray = new bitarray(new boolean[] {true, true, false, false});

and in binary equals:

1100

now want convert int , have tried use methods described on page: how can convert bitarray single int?

however, both these methods converts 1100 3 instead of 12. seems if ignores last 2 bits , considers of size 2 bit, of course answer 3.

one of methods on linked page above, in action:

int[] array = new int[1]; bitarray.copyto(array, 0);

after executing above, bitarray has value 3.

how can express in code want consider 4 bits?

the constructor bitarray(bool[]) accepts values in index order - , copyto uses them in traditional significance (so bitarray[0] least significant bit) - true, true, false, false ends meaning 0011 in binary, not 1100.

it's not ignoring last 2 bits - it's treating initial array in opposite order 1 expected.

if want make first-specified value most significant value when converting bits integers, you'll need reverse input array.


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