C++: Simple and Effective Tips and Tricks to learn C++ Programming Effectively by Smith Benjamin

Author:Smith, Benjamin [Smith, Benjamin]
Language: eng
Format: epub
Published: 2020-08-22T16:00:00+00:00

The value of OR expression given above will be true if the value of the length is less than 0.2 or greater than 9.8.

The value in an AND operator && expression will be returned as true only if both the operands are true and otherwise the result will be false.

Example: ( index < max ) && ( cin >> number)

If, in the above expression, the index is proven to be less than max, and the number is input successfully, then the result produced by the operator will be true. On the other hand, if the index is not less than max, the number will not be read or input by the program. The logical operators AND ‘&&’ as well as OR ‘||’ have an order of evaluation that is fixed. C++ starts the evaluation from left to right and ignores the unnecessary operands, such as when the result is established while evaluating the left operand, the right operands are not evaluated.

The logical operator ! is the NOT operator that works with only one operand located on its right. It checks the value of the operands, and if it is true, then it will be inverted by the NOT operator, and the Boolean value will be returned as false. Similarly, if the value of the variable flag is false or 0, then it will be returned as true. Therefore, NOT operator works by returning the opposite value of the variable flag it evaluates.

Precedence of Boolean Operators

When considering the order of evaluation, the AND operator && is set to have higher precedence than the OR operator ||. Both these logical operators have higher precedence than the assignment operators and lower than other previous operators.

The NOT operator ‘!’, being the unary operator, among others, has higher precedence in the evaluation order.

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