Iterating bits of a char

Question

Assuming I have char "C" whose ascii code is 0110 0111. How can I iterate over its bits? I would like to build a vector from these 1's and 0's....

Answer 1

You can easily iterate over them using bitwise operators:

char c = 'C';
for (int i = 0; i < 8; ++i)
{
  // extract the i-th bit
  int b = ((c & 1<<i) >> i);
  // b will be 1 if i-th bit is set, 0 otherwise

  // do whatever you want with b
}

you can optimize it (as suggested in comments):

int b = ((c >> i) & 1);

Answer 2

A character has an integer value. Something like this will work :

 int myChar = 42;
 String binstr = Integer.toBinaryString(myChar);

The rest I'll leave to you as an exercise - but all you have to do now is iterate over the String representation of your binary value and do whatever it was that you planned on doing.

Answer 3

Just use bitwise checks at each position you care about. Something like the following will create an array bits that holds the individual values.

char c = 'C';
int[] bits = new int[8];

int j = 0;
for(int i = 1; i <= 256; i *= 2){
    bits[j++] = (c & i) > 0 ? 1 : 0;
}