MATLAB: If statement not working correctly

if statementlogical operatorMATLAB

This is driving me insane, I've checked the code 101 times yet can't find any error. This a simple application of if statement.
for i=1:c
    parity=mod(x(i),2);
    d=bistr(i);
    if parity==1 && d==0
        display('Hello');
    elseif parity==0 && d==0
        display('How');
    elseif parity==0 && d==1
        display('Are');
    elseif parity==1 && d==1
        display('You');
    end   
end
i goes from 1 to 192 (c=192). As you can see, parity can either be 0 or 1. d is also either 0 or 1 (it's a matrix of 1s and 0s)
YET THIS CODE WON'T PRINT ANY SINGLE OF THE STRING 'HELLO','HOW','ARE' or 'YOU'. Like I've exhausted all the logical possibilities for parity and d. What is going wrong?
(Yes I've tried printing every single variable at the starting of the loop to see if the loop itself is working fine. IT IS. IT'S JUST THAT THE IF STATEMENT ISN'T GETTING EXECUTED AT ALL!)

Best Answer

Look at the classes of parity and d. My guess is that parity is a double array but d (being an element of an array I assume is called "bitstr" not "bistr") is a char array.
'1' == 1 % returns false
true == 1 % returns true

1 == 1 % returns true
So if d is a char array, bitstr will look something like:
>> bitstr = char(randi(double('01'), 4, 4))
bitstr =
0111
1010
1111
1100
The elements of bitstr are not equal to 0 or 1 but are equal to either '0' or '1'.
>> bitstr == '1'
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