Mixed Expressions: Hidden Dangers
C++ is a strongly typed language. This means that if the context requires a value of one type, it is a syntax error to use a value of another type instead. This is an important principle that allows the programmers to weed out errors with less effort: Instead of hunting the errors down in the laborious process of run-time testing, the programmer is told by the compiler that the code is incorrect.
Consider, for example, the TimeOfDay type that I used in Chapter 2. It is a composite type (not a scalar) with two integer components. Notation exists for setting the field values and for accessing them, and that is all. You cannot add 2 to a TimeOfDay variable or compare it with another TimeOfDay variable (at least ...
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