?So i have this program, but it keeps saying that A, B, C and D are not declared. I believe they need to be objects of a class? How do I fix this program to make it work?

#include

using namespace std;

class time

{

private:

int hours;

int minutes;

int seconds;

int check_time()

{

if(hours>=1 && hours<=24 && minutes>=0 && minutes<60 && seconds>=0 && seconds<60)

return 0;

else

return 1;

}

public:

time()

{

hours=1;

minutes=0;

seconds=0;

}

time(int h,int m,int s) // parameterized constructor

{

hours=h;

minutes=m;

seconds=s;

}

void setTime()

{

while(true)

{

cout<<"Enter Time in 24 hours format (Hours: Minutes: Seconds)"<

cin>>hours; // get hours from user

cin>>minutes; // get minutes

cin>>seconds; // get seconds

if(check_time()==1) // calls check_time() function to check input

{

cout<<"You have entered an invalid time value, hours should between 1 and 24"<

cout<<"minutes and seconds should be between 0 and 60. Please try Again:"<

}

else

{

cout<<"Thank you...!!!"<

break; // to exit from while loop

}

}

}

void getTime() // display time

{

cout<

}

friend time operator +(time t1,time t2); // declare friend function to overload + operator

time addTime(time t1,time t2,time t3) // addTime() function to add three objects

{

time t4;

t4=t1+t2+t3;

return t4;

}

};

time operator +(time t1,time t2) // overload + operator

{

time t4;

t4.hours=t1.hours+t2.hours;

t4.minutes=t1.minutes+t2.minutes;

t4.seconds=t1.seconds+t2.seconds;

return t4;

}

int main() // main function

{

char ch;

while(true)

{

time A(10,10,10); // creates object of time class and invokes parameterized constructor

time B; // invokes default constructor

time C;

C.setTime(); // calls setTime() function

cout<<"Your first time value is: ";

A.getTime(); // calls getTime() function

cout<<"Your second time value is: ";

B.getTime();

cout<<"Your third time value is: ";

C.getTime();

time D;

D=D.addTime(A,B,C); // calls addTime() function to add three objects

cout<<"Total time that has passed is: ";

D.getTime();

cout<<"End of Program !"<

cout<<"Do you want to try again? Press Y for yes or N for no"<

cin>>ch;

if(ch=='N' || ch=='n') // decides whether loop has to continue execution or not

break; // exit from while loop

} // end of while

}// end of main