How to convert positive integers to negative ones by php

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Php The method of converting an integer to a negative number: 1. Multiply a positive integer by negative 1, syntax "$num*(-1)";2. Use the "~" bit operator to reverse the positive integer and add one, you can get the complement of the negative number, syntax "~$num + 1".

Operating environment of this tutorial: Windows 7 system, PHP 7.1 version, DELL G3 computer

php converts positive integers to negative numbers

The first way (supporting decimals)

Output:

The second way (decimals not supported)

Output:

The negative number is stored in memory in the form of complement, and the complement is converted to the original code, which is the corresponding negative number after being converted.

Negative numbers are inverted and added to one to get a complement, but the complement of positive numbers is the same as the original code.

Note: negation and negation are two different concepts. Both operations are complementary forms participating in operations because negative numbers participate.

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