There are a few semantic differences between C and C++ in the way they interpret certain language constructs. These differences may not result in a compiler diagnostic, so it is important to pay attention to them when porting code from C to C++ and vice versa. For example, in C, the size of an enumeration equals the sizeof of an int, whereas in C++, the size of an enumeration doesn’t have to be an int. Also, in C, the result of applying the operator sizeof to a character constant, for example, sizeof(‘c’); equals sizeof(int). In C++, on the other hand, the expression sizeof(‘c’); returns sizeof(char).
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