Question

Write a C++ program that determines the user's age after the  

user enters both the current date and hisher birthdate as 3  

integers:                yyyy mm dd                           

                                                                

Define a class which is named DateType and will be used to    

declare 2 objects: "birthday" and "today". The class will have

a function "output" which will display the date in conventional

form (like it is above next to Date Assigned: Month dd, yyyy

and it will have a second function named    

“input” which will receive one 3 digit date: yyyy mm dd.      

“input” will be used to enter today’s date and the birthdate  

and must only accept valid numbers for month and day.              

                                                                

EXAMPLE: If the user entered the #’s:      2018 2 6        

            then output would display         Feb 6, 2018       

                                                                

After the user enters the birthdate, display the dates in     

conventional form and the user's age.                         

                                                                

EXAMPLE: If the user entered a birthdate: 1999 7 4        

                                                                 

            The program would display:                          

                                                                

                    Today is Feb 6, 2018                         

                    Your birthday was on Jul 4, 1999            

                    You are 18 years old                        

Answer 1

Screenshots of the code:

Screenshots of the output:

The Code Used:

#include<iostream>
using namespace std;
class DateType
{
   public:
       int day,month,year;
       void input();
       void output();
};
void DateType::input()
{
   while(1)
   {
       cout<<"Enter the date in (yyyy mm dd) format: ";
       cin>>year>>month>>day;
       if(month<1 || month >12)
       {
           cout<<"Invalid month enter the date again."<<endl;
           continue;
       }
       if(month==4||month==6||month==9||month==11)
       {
           if(day<1||day>30)
           {
               cout<<"Invalid day enter the date again."<<endl;
               continue;
           }
       }
       else if(month==2)
       {
           if(day<1||day>28)
           {
               cout<<"Invalid day enter the date again."<<endl;
               continue;
           }
       }
       else
       {
           if(day<1||day>31)
           {
               cout<<"Invalid day enter the date again."<<endl;
               continue;
           }
       }
       break;
   }
}
void DateType::output()
{
   string monthName;
   switch(month)
   {
       case 1:
           monthName = "Jan";
           break;
       case 2:
           monthName = "Feb";
           break;
       case 3:
           monthName = "Mar";
           break;
       case 4:
           monthName = "April";
           break;
       case 5:
           monthName = "May";
           break;
       case 6:
           monthName = "June";
           break;
       case 7:
           monthName = "July";
           break;
       case 8:
           monthName = "Aug";
           break;
       case 9:
           monthName = "Sep";
           break;
       case 10:
           monthName = "Oct";
           break;
       case 11:
           monthName = "Nov";
           break;                              
       default:
           monthName = "Dec";  
   }
   cout<<monthName<<" "<<day<<", "<<year<<endl;
}
void calculateAge(DateType today,DateType birthday)
{
   int age;
   if(today.month<birthday.month)
   {
       age = today.year - birthday.year -1;
   }
   else if(today.month==birthday.month)
   {
       if(today.day<birthday.day)
       {
           age = today.year - birthday.year -1;
       }
       else
       {
               age = today.year - birthday.year;
       }
   }
   else
   {
           age = today.year - birthday.year;
   }
   cout<<"You are "<<age<<" years old."<<endl;
}
int main()
{
   DateType today;
   DateType birthday;
   cout<<"Enter todays date"<<endl;
   today.input();
   cout<<"Enter your birthdate"<<endl;
   birthday.input();
   cout<<endl;
   cout<<"Today is ";
   today.output();
   cout<<"Your birthday was on ";
   birthday.output();
   calculateAge(today,birthday);
   return 0;
}

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