Usage of ~ in c++

The tilde (~) in C is used for bitwise inversion operation, inverting each binary bit of a variable or expression: (1) It converts a positive integer into a negative number, and a negative number into a positive number Number; (2) Convert the Boolean value true to false and vice versa.

The tilde (~) in C

~ is used for the unary operator in C, executing Bitwise negation operation.

Purpose:

~ The operator inverts each binary digit of a variable or expression. For integers, it converts positive numbers to negative numbers and negative numbers to positive numbers. For boolean values, it converts true to false and vice versa.

Syntax:

~expression

where expression is an integer, Boolean value, or bitmask to be inverted.

Example:

int num = 5;
cout << ~num; // 输出：-6

Bitwise negation rules:

~ The operator takes the binary bits according to the following rules Reverse:

• 0 is converted to 1
• 1 is converted to 0

Other uses: except

In addition to bitwise negation, ~ can also be used for:

• Pointer dereference: * ~p is equivalent to *(p - 1 ), where p is a pointer to an object.
• Get the destructor of the class: ~ClassName Represents the destructor of the class ClassName.

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