title: Is this an overflow arithmetic calculation?
body: <p>So when I read the book and it says that overflow can't occur when add different signs and subtraction of the same sign.
   But I have question when I do this: 185 - 122
  I converted binary of 122 to 2s complement and did the addition, which is different signs:
  185+(-122) and when I add them together, I got the sign bit overflow to 100111111. But if I cut off the MSB on the left, it is the correct answer. Is it an overflow?</p>