Having issue with base constructors used in derived class - c++

Question

I'm running a code in which I'm using two base classes and deriving a derived class from them. I'm calling both of their constructors in the Derived class and I'm giving arguments in main. When I compile it doesn't give me any kind of error. But when I try to run the program it doesn't run, I'm really confused!
Here is my code
#include <iostream>
#include<iomanip>
using namespace std;
class Date
{
int day;
int month;
int year;
public:
Date(int d,int m,int y)
{
day=d;
month=m;
year=y;
}
void display()
{
cout<<endl<<day<<"\\"<<month<<"\\"<<year<<endl;
}
void set()
{
cout<<"Enter day :";
cin>>day;
cout<<"Enter month :";
cin>>month;
cout<<"Enter year :";
cin>>year;
}
// sets the date members
};
class Time
{
int hour;
int minute;
int second;
public:
Time(int h,int min,int s)
{
hour=h;
minute=min;
second=s;
}
void display() // displays the time
{
cout<<endl<<hour<<":"<<minute<<":"<<second<<endl;
}
void set()
{
cout<<"Enter hour :";
cin>>hour;
cout<<"Enter minute :";
cin>>minute;
cout<<"Enter seconds :";
cin>>second;
}
// sets the time members
};
class DateAndTime : public Date, public Time
{
int digital;
public:
DateAndTime(int a,int b,int c,int d,int e,int f):
Date(a,b,c),Time(d,e,f)
{
}
void set()
{
Date:set();
Time:set();
}
void display()
{
Date:display();
Time:display();
}
// prints date and time
};
int main()
{
DateAndTime Watch(17,02,1999,03,36,56);
Watch.display();
Watch.set();
Watch.display();
return 0;
}

Answer 1

The function
void set()
{
Date:set();
Time:set();
}
is wrong but the compiler does not complain because it treats Date: and Time: as labels. If you separate the labels and the function calls, the function is:
void set()
{
Date: // Unused label.
set(); // Calls the function again, leading to infinite recursion
// and stack overflow.
Time: // Unused label.
set(); // The function never gets here.
}
You need to use:
void set()
{
Date::set();
Time::set();
}
You need to update display similarly. Use:
void display()
{
Date::display();
Time::display();
}