Design a class TIME which stores hr,min and sec. The class should have the methods to support the following : i) User may give the time value in 24-hour format. ii) User may give the time in AM/PM format. iii) Display the time in 24-hour format. iv) Display the time in AM/PM format. v) User may like to add minute with a time value.

Source Code :

#include<iostream.h>

class tim {

      int hr,min,sec,fl;

      char a;

      public:

      tim() {

            hr=0;

            min=0;

            sec=0;

            fl=0;

      }

      void get_value() {

            int c;

            cout<<endl<<"ENTER TIME";

            cout<<endl<<"1. Enter Time in 24 hr Format";

            cout<<endl<<"2. Enter Time in 12 hr Format";

            cout<<endl<<"Enter Choice : ";

            cin>>c;

            switch(c) {

                  case 1: {

                        cout<<endl<<"Hour : "; 

                        cin>>hr;

                        cout<<"Minute : ";

                        cin>>min;

                        cout<<"Second : ";

                        cin>>sec;

                        if(hr>23 || min>59 || sec>59) {

                              cout<<"Invalid Entry of Time";

                        }

                        else {

                              fl=1;

                              cout<<"Time Entered Successfully";

                        }

                  }break;

                  case 2: {

                        cout<<endl<<"Hour : ";

                        cin>>hr;

                        cout<<"Minute : ";

                        cin>>min;

                        cout<<"Second : ";

                        cin>>sec;

                        cout<<"Enter a for am/p for pm : ";

                        cin>>a;

                        if(hr>12 || min>59 || sec>59) {

                              if(a=='p' || a=='a')

                                    cout<<"Invalid Entry of Time";

                        }

                        else {

                              fl=2;

                              cout<<"Time Entered Successfully";

                        }

                  }break;

                  default: {

                        cout<<"INVALID CHOICE";

                  }

            }

      }

      void show_value() {

            if(fl==1) {

                  cout<<endl<<"In 24-Hour Format : "<<hr<<":"<<min<<":"<<sec;

                  cout<<endl<<"In 12-Hour Format : ";

                  if(hr>12)

                        cout<<(hr-12)<<":"<<min<<":"<<sec<<" pm";

                  else

                        cout<<hr<<":"<<min<<":"<<sec<<" am";

            }

            else if(fl==2) {

                  cout<<endl<<"In 24-Hour Format : ";

                  if(a=='p')

                        cout<<(hr+12)<<":"<<min<<":"<<sec;

                  else if(a=='a')

                        cout<<hr<<":"<<min<<":"<<sec;

                  cout<<endl<<"In 12-Hour Format : ";

                  if(a=='p')

                        cout<<hr<<":"<<min<<":"<<sec<<" pm";

                  else

                        cout<<hr<<":"<<min<<":"<<sec<<" am";

            }

            else {

                  cout<<"Enter Time First";

            }

      }

      void add() {

            int mm;

            if(fl==1 || fl==2) {

                  cout<<"Enter Minutes to be Added with Time Entered : ";

                  cin>>mm;

                  if((mm+min)>59) {

                        hr+=(min+mm)/60;

                        min=(mm+min)%60;

                  }

                  else {

                        min+=mm;

                  }

            }

            else

                  cout<<"Enter Time First";

      }                

};

int main() {

      tim ob1;

      int ch;

      while(true) {

            cout<<endl<<"   MAIN MENU ";

            cout<<endl<<"1. Enter Time";

            cout<<endl<<"2. Display Time";

            cout<<endl<<"3. Add Minute With The Time";

            cout<<endl<<"4. Exit";

            cout<<endl<<"Enter Choice : ";

            cin>>ch;

            switch(ch) {

                  case 1: {

                        ob1.get_value();

                  }break;

                  case 2: {

                        ob1.show_value();

                  }break;

                  case 3: {

                        ob1.add();

                        ob1.show_value();

                  }break;

                  case 4: {

                        exit(0);

                  }break;

                  default: {

                        cout<<"INVALID CHOICE";

                  }

            }

      }

}    

Output :

MAIN MENU

1.  Enter Time

2.  Display Time

3.  Add Minute With The Time

4.  Exit

Enter Choice : 1

ENTER TIME

1.  Enter Time in 24 hr Format

2.  Enter Time in 12 hr Format

Enter Choice : 1

Hour : 15

Minute : 30

Second : 45

Time Entered Successfully

MAIN MENU

1.  Enter Time

2.  Display Time

3.  Add Minute With The Time

4.  Exit

Enter Choice : 2

In 24-Hour Format : 15:30:45

In 12-Hour Format : 3:30:45 pm

MAIN MENU

1.  Enter Time

2.  Display Time

3.  Add Minute With The Time

4.  Exit

Enter Choice : 3

Enter Minutes to be Added with Time Entered : 40

In 24-Hour Format : 16:10:45

In 12-Hour Format : 4:10:45 pm

MAIN MENU

1.  Enter Time

2.  Display Time

3.  Add Minute With The Time

4.  Exit

Enter Choice : 4