Thread: A beginner question about classes

Code:

#include <string>
#include <vector>
#include <iostream>
using namespace std;


class TimeDifference
{
  public:
    int x,y,z,seconds(string time1, string time2)


{
        cin >> time1 >> time2;
        x=(time1[0]*10+time1[1])-(time2[0]*10+time2[1]);
         y=(time1[3]*10+time1[4])-(time2[3]*10+time2[4]);
        z=(time1[6]*10+time1[7])-(time2[6]*10+time2[7]);
return x*3600+y*60+z;
  }
};

This is my code. Basically you need to input time in format 11:45:30 and 11:45:45 for example. It should calculate the seconds difference between the two times. I get an error saying "undefined reference to WinMain@16". Please help ASAP. Thanks in advance