# V556. Values of different enum types are compared.

The analyzer detected a potential error: code contains comparison of enum values which have different types.

Consider a sample:

    enum ErrorTypeA { E_OK, E_FAIL };
    enum ErrorTypeB { E_ERROR, E_SUCCESS };
    void Foo(ErrorTypeB status) {
      if (status == E_OK)
      { ... }
    }

The programmer used a wrong name in the comparison by accident, so the program's logic is disrupted. This is the correct code:

    void Foo(ErrorTypeB status) {
       if (status == E_SUCCESS)
      { ... }
    }

Comparison of values of different enum types is not necessarily an error, but you must review such code.

This diagnostic is classified as:

CWE-697 CERT-MSC01-C

You can look at examples of errors detected by the V556 diagnostic.