Logical Expressions
Often you must test for more than one condition. For example, for a character to be a lowercase letter, its value must be greater than or equal to 'a' and less than or equal to 'z'. Or, if you ask a user to respond with a y or an n, you want to accept uppercase (Y and N) as well as lowercase. To meet this kind of need, C++ provides three logical operators to combine or modify existing expressions. The operators are logical OR, written | |; logical AND, written &&; and logical NOT, written !. Examine them now.
The Logical OR Operator: ||
In English, the word or can indicate when one or both of two conditions satisfy a requirement. For example, you can go to the MegaMicro company picnic if you or your spouse work for MegaMicro, ...
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