Could you tell me how to calculate the subtraction of negative numbers in the bottom calculation?

0x80000000, which is the minimum value of shaping, so why
0-0x80000000 or 0x80000000?
how exactly is the symbol bit calculated

May.08,2021

overflowed. The maximum positive number of signed integers of this length is 0x7FFFFFFF
subtraction by adding the opposite number, and taking the opposite number by adding 1. The computer does addition and subtraction and does not take into account your inconsistent symbols. Only when you convert to the decimal system (signed number) will you pay attention to the symbol bit
. Read more, learn more, and you will understand a lot of problems when you look back. If you don't learn enough, you must think about this and that. There must be a lot of questions that can't be figured out

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e41a9f-662f2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e41a9f-662f2.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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