Sams Teach Yourself C++ in 21 Days

Exercises

1. The inclusion guard statements for the header file STRING.H would be:
   #ifndef STRING_H
   #define STRING_H
   ...
   #endif


2. The following is one possible answer:
   0: #include
   1:
   2: using namespace std;
   3: #ifndef DEBUG
   4: #define ASSERT(x)
   5: #elif DEBUG == 1
   6: #define ASSERT(x) \
   7: if (! (x)) \
   8: { \
   9: cout << “ERROR!! Assert “ << #x << “ failed” << endl; \
   10: }
   11: #elif DEBUG == 2
   12: #define ASSERT(x) \
   13: if (! (x) ) \
   14: { \
   15: cout << “ERROR!! Assert “ << #x << “ failed” << endl; \
   16: cout << “ on line “ << LINE << endl; \
   17: cout << “ in file “ << FILE << endl; \
   18: }
   19: #endif


3. The following is one possible answer:
   #ifndef DEBUG
   #define DPRINT(string)
   #else
   #define DPRINT(STRING) cout << #STRING ;
   #endif


4. The following is one possible answer:
   class myDate
   {
   public:
   // stuff here...
   private:
   unsigned int Month : 4;
   unsigned int Day : 8;
   unsigned int Year : 12;
   }

874 Appendix D

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