Thread: Passing Array of Object gives compilation ERROR

Hello Eveybody


This is my question
Define a class named HOUSING in C++ with the following descriptions:
Private members
REG_NO integer(Ranges 10 — 1000)
NAME Array of characters(String)
TYPE Character
COST Float
Public Members
• Function Read_Data( ) to read an object of HOUSING type
• Function Display() to display the details of an object
• Function Draw Nos( ) to choose and display the details of 2 houses selected randomly from an array of 10 objects of type HOUSING Use random function to generate the registration nos. to match with REGNO from the array.


Now I' trying to do this by this way

Code:

#include <iostream.h>
      #include <conio.h>
      #include <stdlib.h>
    
      class housing
      {
            private:
                int REG_NO;
                char NAME[10];
                char TYPE;
                float COST;
            public:
                void Read_Data();
                void Display();
                void DrawNos(housing);
      };
      void housing::Read_Data( )
      {
            cout<<"Enter Registration No: ";
            cin>>REG_NO;
            cout<<"Enter Name: ";
            cin>>NAME;
            cout<<"Enter Type: ";
            cin>>TYPE;
            cout<<"Enter cost: ";
            cin>>COST;
      }
      void housing::Display()
      {
      }
      void housing::DrawNos(housing* h1[])
      {
           int N=10;
           int randomREG=random(10);
           N=random(2);
           cout<<h1[N]->REG_NO;
      }
      void main()
      {     
            int i=0;
            housing* h[5];
            for(i=0;i<5;i++)
            {
                    h[i]->Read_Data();
            }
            for(i=0;i<5;i++)
            {
                    h[i].DrawNos(h); // I am trying to pass the array of object to DrawNos function but getting error
            }
      }

I am tryin to pass the entire array of object in DrawNos(). but getting comilation error -

32: 'housing:rawNos(housing * *)' is not a member of 'housing'
48: Structure required on left side of . or .*

What is the problem? How can I pass the array of object in function and use it.


Please help me with this problem.

and you must never ever use std::cin >> to read into a char array.

That "must never" is incorrect. It is possible to properly use the extraction operator>> to extract C-strings, provided you limit the number of characters you will read with a setw() prior to the extraction.

Code:

char name[10];
cin >> setw(10) >> name;

I do however agree that using std::string would be better. Also using getline() would be my preferred way of retrieving this information into a string or a C-string.

Jim

Better to lead newbies on a safe path and letting them find out the evil path by themselves when they're more experienced.

And what is this evil path you talk about? There is nothing inherently evil about properly using the extraction operator, nor is there anything inherently evil about character strings. In my opinion not teaching the proper way of using these constructs is the true evil.

Jim

In my opinion sticking ones head in the ground is much worse than teaching how to properly use these constructs. Dealing with character strings and pointers is problematic but these constructs can't be ignored, they are an integral part of the language.

I do agree however that many C++ books and instructors wait far too long before they start teaching C++ concepts like std::string and the container classes.

Jim