Question

Ok, I have the code done in a way that works great and uses the increment ++ and decrement — operators.

unsigned int atob(const char* input)
{

    int i = 0;

    while (input[i] == '0' || input[i] == '1') i++;

    unsigned result = 0;
    unsigned currentBit = --i;

    while ((*input == '0') || (*input == '1')) {
        char isCurrentBitSet = *input == '1';
        unsigned setValue = (isCurrentBitSet << currentBit--);
        result |= setValue;
        input++;
    }

    return result;
}

Now, I need to get rid of all dec(–)/inc(++) except for input++ at the bottom of the while statement. I am baffled at how to do this implementation.

Answer 1

Here you go:

unsigned int atob(const char* input)
{
  unsigned result = 0;

  while ((*input == '0') || (*input == '1')) {
    result = (result << 1) | (*input++ - '0');
  }

  return result;
}

Saves some stack space too 🙂