[C++] class String
#include class String { private: char* _string; int _length; public: String() : _string(NULL), _length(0) {} String(const String& s) : _string(NULL), _length(0) { _length = s._length; if (_length > 0) { _string = new char [s._length + 1]; strcpy (_string, s._string); } } String(const char* s) : _string(NULL), _length(0) { if (s != NULL) { _length = strlen(s); _string = new char [_length + 1]; st..