c) Sign and Magnitude vs Two's Complement

What methods can you use to represent negative binary numbers?

Sign and magnitude, or two’s complement.

How does sign and magnitude work?

It is when you add a 0 or 1 at the start of the number to represent its sign.

What is the first character in sign and magnitude equivalent to?

The sign of the number.

Does the first character in sign and magnitude have a numerical value?

No.

Define Two’s Complement

Most significant bit is made negative (eg -128 or -8), and all bits to the left are flipped until the last positive bit is reached.

How do you subtract with two’s complement?

Convert a number to being negative, then add the numbers together.