Python series------Computer operation process

How the computer does the arithmetic

in a computer system, the values are all represented by the complement.

• A positive complement

Positive complement and source code are the same.

• The complement of negative numbers

The sign bit is unchanged, and the other bits are reversed plus 1.

An expression	Convert to Anti-code	Shift to complement	Calculation results	Switch to source code
10+2	0000 1010 + 0000 0010	0000 1010 + 0000 0010	0000 1100	0000 1100
+ ( -2)	0000 1010 + 1111 1101	0000 1010 + 1111 1110	0000 1000	0000 1000
All ( -4)	0000 0011 + 1111 1011	0000 0011 + 1111 1100	1111 1111	1000 0001

Note: Positive inverse code is the same as the source code is the same, negative inverse code is negative absolute value of the bitwise negation, complement is negative absolute value reversed, sign bit unchanged plus a

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Python series------Computer operation process