1 and 2 complement systems

Question

I am trying to understand the differences between the two systems and their impact on C programming.

From what I learned from Wikipedia:

• both systems are used to represent negative numbers
• one addition is applied bitwise NOT to a negative number (the system has +0 and -0)
• two additions are performed, as in step 2, and adds 1 (excludes +/- 0)

Did I miss something else?

My questions:

• What architectures support which system? What is the most common these days (1 or 2 supplements)?
• In what sense should we consider these systems when programming in C? Does this basically make sense only in the embedded world?

Thanks in advance!

Answer 1

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, - , , , -2 ^ 31 +2 ^ 31 - 1, . , - power-of-two ( , , , ).

Answer 2

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, , , , . , , , .