Thread: What am I doing wrong?

Hi, I am trying to write this program and obviously I have problems with it. I am not sure where and what I am doing wrong, anyone's help is much appreciated, thanks for the time.

Code:

#include <iostream.h>
#include <iomanip.h>
#include <assert.h>

class Time
{
	public:
		Time(int h=0, int m=0, int s=0);
		void printStandard();
		void add(Time t);
		void subtract(Time t);
		void getFromKbd();
	private:
		int hour;
		int min;
		int sec;
};
Time::Time(int h, int m, int s)
{
	hour = (h>=0 && h<24) ? h:0;
	min = (m>=0 && m<60) ? m:0;
	sec = (s>=0 && m<60) ? s:0;
}
void Time::printStandard()
{
   cout << ((hour % 12 == 0) ? 12 : hour % 12) << ':'
        << (min < 10 ? "0" : "") << min  << ':'
        << (sec < 10 ? "0" : "") << sec
	    << (hour < 12 ? " AM" : " PM");
}
void Time::add()         //  Adds t to the object  through which the function is called
{
	Time t;
	
	cout << "Sum of the time is " << t+t.getFromKbd();
	

}
void Time::subtract()     // Subtracts t from the object through which the function is called
{
	cout << "Difference of the time is " << t-t.getFromKbd();
}

void Time::getFromKbd()    // t.getFromKbd() will get values for t.hour, t.min, and t.sec from the keyboard, allows user to input as military time
{
	
	cout << "Enter the hour(s): ";
	cin >> t.hour;
	cout << "Enter the minute(s): ";
	cin >> t.min;
	cout << "Enter the second(s): ";
	cin >> t.sec;

}

int main()
{
	Time t(12, 45, 30);      
	t.printStandard();			// should display 12:45:30 AM or PM
 	
 	t.getFromKbd();				// user inputs his/her time
	t.add();					// adds user time to 12:45:30
	t.printStandard();			// displays sum of times
	
	t.subtract();				// subtracts both times
	t.printStandard();			// prints times
	
	return 0;
}

Post a specific problem.

Kuphryn

I think possibly you need to work with a reference to the time object. Declaring the time obj within a function and returning void will alter nothing during runtime. I think that's what you mean.
Also, the getkboard() function doesn't get anything from the keyboard to work with. Don't forget, you need an instance of any object to work with. Classes cannot be manipulated.