I need to store a list with chemical elements and its properties. I have programmed a class like this:
Qt Code: 
  1. class Elementos
  2. {
  3. public:
  4. 	Elementos();
  5. 	~Elementos();
  6. 	int getZsymbol(char *Symbol);
  7.         .....
  8. private:
  9.        enum {MaxElem=118,NameLen=16,NN=-999};
  10.        struct ElementData
  11. 	{  
  12. 		int AtomicNumber;		
  13. 		char Symbol[3+1];		
  14. 		char SpanishName[NameLen+1];
  15. 		char EnglishName[NameLen+1];
  16. 		char GermanName[NameLen+1];
  17.              .....
  18.        }Propiedades[MaxElem],*p;
  19. }
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And in cpp file:

Qt Code: 
  1. #include "elementos.h"
  2.  
  3. Elementos::Elementos()
  4. {
  5. 	ElementData Propiedades[MaxElem] =
  6. 	{
  7. 	       {   1, "H" , "Hidrógeno"	, "Hydrogen"     , "Wasserstoff"  }, 
  8. 		{   2, "He", "Helio"		, "Helium"       , "Helium"}
  9.                ...
  10.         };
  11.        p=&Propiedades[0];
  12. }
  13.  
  14. int Elementos::getZsymbol(char *Symbol)
  15. {
  16. 	ElementData *q;
  17. 	q=p;
  18. 	string c = string(Symbol);
  19. 	for (int i=0;i<MaxElem;i++){
  20. 		string s = string(q->Symbol);
  21. 		if (c==s) return q->AtomicNumber;
  22. 		q++;
  23. 	}
  24. 	return 0;
  25. }
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When i compile and use in debug mode works fine, but in release mode don't work.

I think that p=&Propiedades[0]; point to the first element of the Propiedades, but in getZsymbol function this pointer takes a bad value. Someone knows how can I correct this to work fine (debug and release).

Thanks