Question

Write program that prompts the user to enter a person's date of birth in numeric form such as 8-27-1980. The program then outputs the date of birth in the form: August 27, 1980. Your program must contain at least two exception classes: invalidDay and invalidMonth. If the user enters an invalid value for day, then the program should throw and catch an invalidDay object. Similar conventions for the invalid values of month and year. (Note that your program must handle a leap year.)

c++

Answer 1

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Please use below code:

#include<iostream>

#include<ctime>

#include <exception>

#include <string.h>

using namespace std;

int ValidateDate(int day, int month,int year);

//Exception classes

struct InvalidDay : public std::exception

{

              const char * what () const throw ()

    {

              return "Invalid Day Exception!!";

    }

};

struct InvalidMonth : public std::exception

{

              const char * what () const throw ()

    {

              return "Invalid Month Exception!!";

    }

};

struct InvalidYear : public std::exception

{

              const char * what () const throw ()

    {

              return "Invalid Year Exception!!";

    }

};

int main()

{

    string inputTime,originalInputTime;

    int day, month,year;

    cin >> originalInputTime; // To read the string

    inputTime = originalInputTime; //preserve the original string

    string delimiter = "-";

    int positionOfToken = inputTime.find(delimiter);

   

    //extract month from the string, based on delimiter "-"

    month = stoi(inputTime.substr(0,positionOfToken));

    inputTime = inputTime.erase(0,positionOfToken+1); //erase the string

   

    //extract day

    positionOfToken = inputTime.find(delimiter);

    day = stoi(inputTime.substr(0,positionOfToken));

   

    inputTime = inputTime.erase(0,positionOfToken+1); //erase the string

    //extract year

    positionOfToken = inputTime.find(delimiter);

    year = stoi(inputTime.substr(0,positionOfToken));

   

   

try {

        //try to validate the date, if exception thrown then catch it if successful then add print the desired output

        if(ValidateDate(day,month,year) == 0)

        {

            char date_string[100];

            struct tm dateOfBirth = {}; //declare empty time struct, construct the time struct using originalInputTime

             if(strptime(originalInputTime.c_str(), "%m-%d-%Y", &dateOfBirth) == NULL) //convert the given string into the date format separated by -

            {

                    std::cout << "parsing failed" << std::endl;

            }

             

                      //convert the date in desired format

                      strftime(date_string, 50, "%B %d, %Y", &dateOfBirth);

                      //print the date

            cout << date_string;

           

        }

        

     }

     //exception for InvalidDay, InvalidMonth, InvalidYear

     catch(InvalidDay& e) {

      std::cout << e.what() << std::endl;

        }

    catch(InvalidMonth& e) {

      std::cout << e.what() << std::endl;

        }

    catch(InvalidYear& e) {

      std::cout << e.what() << std::endl;

        }

    catch(std::exception& e) {

      //other standard errors

      std::cout << e.what() << std::endl;

   }

return 0;

}

//function to validate date

int ValidateDate( int day, int month, int year )

{

              if( year < 0 )

                             throw InvalidYear();

                            

              if( month < 0 || month > 12)

                             throw InvalidMonth();

             

              if(day < 0 )

                  throw InvalidDay();

             

              //validation for 30 days

              if( month == 4 || month == 6 || month == 9 || month == 11)

              {

                             if( day > 30)

                             throw InvalidDay();

              }

              else if( month == 2) //leap year validation

              {            

                             if ( year % 4 == 0 )

                             {

                                                          if( day > 29 )

                                                                        throw InvalidDay();

                             }

                             else

                             {

                                                          if( day > 28)

                                                                        throw InvalidDay();

                             }

              }

              else

              {

                  //else wold be Months having 31 days

                             if( day > 31)

                                           throw InvalidDay();

              }

             

              return 0; //successful validation

}

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output: