Problem with constructor
 

#include <iostream>

#include <string.h>

using namespace std;



class Date

{

 public : Date();

          void setDate(int,string,int);

          void printDate();

          

 private : int day;

           string mth;

           int year;



};//end class





//date constructor

Date::Date()

{

 day = 01;

 mth = "Jan";

 year = 1990;

} 



//setDate

void Date::setDate(int inDay,string inMth, int inYear)

{

     day = inDay;

     mth = inMth;

     year = inYear;

     cout<<"Date set to "<<day<<"-"<<mth<<"-"<<year<<endl;     

}//end setDate



//printDate

void Date::printDate()

{

cout<<day<<"-"<<mth<<"-"<<year<<endl;

}//end print date



//functions declaration

void menu();

void setDateMenu(Date myDate);



int main()

{

    char choice;

    //show menu

    menu();

    //new a date object

    Date myDate;

    

    //read in the choice 

    cin>>choice;

    //change it to a lower case.

    choice = tolower(choice);

    

    while (1)

    {

          switch (choice)

          {

           case 'a' : setDateMenu(myDate);

                      //myDate.setDate(10,"Jan",2007);

                      system("pause");

                      system("CLS");

                      break;

           

           case 'b' : myDate.printDate();

                      system("pause");

                      system("CLS");

                      break;            

                     

           case 'q' : cout<<"Exiting system. Thank you for using calendar system."<<endl;

                      system("pause");

                      exit(0);

                      break;

                     

           default : cout<<"Please enter A to H only. Q to quit."<<endl;

                     system("pause");

                     system("CLS");

                     break;

          }//end switch

      cout << endl;                 

      menu(); 

      cin >> choice;

      choice = tolower(choice);

    }//end while

    

    

    system("pause");

}//end main



void menu()

{

     cout<<"A)\tSet Date"<<endl;

     cout<<"B)\tReturn Date"<<endl;

     cout<<"C)\tReturn number of days in month"<<endl;

     cout<<"D)\tReturn number of days passed in a year"<<endl;

     cout<<"E)\tCheck if leap year"<<endl;

     cout<<"F)\tReturn which day of week"<<endl;

     cout<<"G)\tAdd days to date"<<endl;

     cout<<"H)\tPrint month calendar"<<endl;

     cout<<"Q)\tQuit"<<endl;

     cout<<endl;

     cout<<"Please enter choice: "<<endl;

}//end menu



//setDate

void setDateMenu(Date myDate)

{

 //bool year = false;

 int inDay;

 string inMth;

 int inYear;

 

 cout<<"Enter Day: "<<endl;

 cin>>inDay;

 

 cout<<"Enter Month: "<<endl;

 cin>>inMth;

 

 cout<<"Enter Year: "<<endl;

 cin>>inYear;

 

 for(int i=0;i<inMth.length();i++)

 {//convert all the input for month to lower case

   tolower(inMth[i]);      

 }//end for loop



 myDate.setDate(inDay,inMth,inYear);

}//end setDateMenu

I have problem doing a set date for the above codes. every time i invoked the setDateMenu(Date myDate) to set a new date to my object myDate, it manages to take in the correct day,mth and year (I did a cout at void Date::setDate(int inDay,string inMth, int inYear) It shows the new day,mth and year set.

However, when i did a print date (option B), the new date values are still not saved into the dates and it still prints the default date value which is 01-Jan-1990.

Anyone got any idea where the codes went wrong and why the new values of the day,mth and year aren't passed into the object?

Re: Problem with constructor
 

Your program does not include <string> for std::string class, so how in the world are you getting it to compile????? Don't attempt to execute a program that contains compiler errors or warnings. Yes, warnings in your code are usually errors too.

Re: Problem with constructor
 

void setDateMenu(Date myDate);

You pass Date by value so set a new date to Date copy. The original object is intact.
Pass by reference:

void setDateMenu(Date& myDate);

Common error...
I hope now you know that argument passed by value in C and C++ ;)...

Re: Problem with constructor
 

Thanks for the help. i made a reference variable to myDate and it worked.

Re: Problem with constructor
 

Yes, rather! It would be surprising if it didn't work ;)