Most of the languages including C, C++, Java and Python provide the boolean type that can be either set to False or True.
Consider below programs that use Logical Not (or !) operator on boolean.
The outputs of above programs are as expected, but the outputs following programs may not be as expected if we have not used Bitwise Not (or ~) operator before.
Reason: The bitwise not operator ~ returns the complement of a number i.e., it switches each 1 to 0 and each 0 to 1. Booleans True and False have values 1 and 0 respectively.
˜being the bitwise not operator,
- The expression “˜True” returns bitwise inverse of 1.
- The expression “˜False” returns bitwise inverse of 0.
Java doesn’t allow ~ operator to be applied on boolean values. For example, the below program produces compiler error.
6: error: bad operand type boolean for unary operator '~' System.out.println(~a); ^ 7: error: bad operand type boolean for unary operator '~' System.out.println(~b); ^ 2 errors
“Logical not or !” is meant for boolean values and “bitwise not or ~” is for integers. Languages like C/C++ and python do auto promotion of boolean to integer type when an integer operator is applied. But Java doesn’t do it.
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