Multiple Inheritance in Object-Oriented Programming using C++
"Explore multiple inheritance in C++ along with Date and Time classes for creating a DateTime class. Understand the concept of inheriting properties from multiple parent classes in object-oriented programming."
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Multiple Inheritance Andy Wang Object Oriented Programming in C++ COP 3330
Multiple Inheritance C++ supports multiple inheritance A class can inherit properties from more than one base class (multiple parent classes) Not all object-oriented languages support multiple inheritance (e.g., Java)
data.h #ifndef _DATE_H #define _DATE_H class Date { protected: Inline functions: code inserted at each invocation point int day, month, year; public: Date() { day = month = 1; year = 1900; } Date(int d, int m, int y) { day = d; month = m; year = y; } int getDay() const { return day; } int getMonth() const { return month; } int getYear() const { return year; } }; #endif
time.h #ifndef _TIME_H #define _TIME_H class Time { protected: public: }; #endif int hour, min, sec; Time() { hour = min = sec = 0; } Time(int h, int m, int s) { hour = h; min = m; sec = s; } int getHour() const { return hour; } int getMin() const { return min; } int getSec() const { return sec; }
datetime.h #ifndef _DATETIME_H #define _DATETIME_H const int DT_SIZE = 20; class DateTime : public Date, public Time { protected: char dateTimeString[DT_SIZE]; public: DateTime(); DateTime(int, int, int, int, int, int); const char *getDateTime() const { return dateTimeString; } }; #endif
datetime.cpp #include <cstring> #include <cstdlib> #include DateTime.h const int TEMP_SIZE = 10; DateTime::DateTime() : Date(), Time() { strcpy(dateTimeString, 1/1/1900 0:0:0 ); }
datetime.cpp DateTime::DateTime(int dy, int mon, int yr, int hr, int mt, int sc) : Date(dy, mon, yr), Time(hr, mt, sc) { TEMP_SIZE); strcat(dateTimeString, / ); strcpy(dateTimeString, itoa(getDay(), temp, TEMP_SIZE); strcat(dateTimeString, / ); strcpy(dateTimeString, itoa(getYear(), temp, TEMP_SIZE); strcat(dateTimeString, ); char temp[TEMP_SIZE]; strcpy(dateTimeString, itoa(getMonth(), temp,
datetime.cpp strcpy(dateTimeString, itoa(getHour(), temp, TEMP_SIZE); strcat(dateTimeString, : ); strcpy(dateTimeString, itoa(getMin(), temp, TEMP_SIZE); strcat(dateTimeString, : ); strcpy(dateTimeString, itoa(getSec(), temp, TEMP_SIZE); }
main.cpp #include <iostream> #include DateTime.h using namespace std; int main() { DateTime emptyDay; cout << emptyDay.getDateTime() << endl; } DateTime pastDay(2, 4, 60, 5, 32, 27); cout << pastDay.getDateTime() << endl; return 0;
