Type Conversions
Statements and expressions should normally use variables and constants of just one type. If, however, you mix types, C doesn't stop dead in its tracks the way, say, Pascal does. Instead, it uses a set of rules to make type conversions automatically. This can be a convenience, but it can also be a danger, especially if you are mixing types inadvertently. (The lint program, found on many UNIX systems, checks for type "clashes." Many non-UNIX C compilers report possible type problems if you select a higher error level.) It is a good idea to have at least some knowledge of the type conversion rules.
The basic rules are these:
When appearing in an expression, char and short, both signed and unsigned, are automatically converted to ...
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