Passing array as argument in Parameterized Constructor

Question

I am trying to overload the >> operator to rotate the elements in the array.I have removed the array declaration and initialization for shorten the code. But compiler is giving error as "invalid use of undefined type 'class ABC'." and many more.

#include<iostream>
using namespace std;
class ABC
{
      int iarr[10],n2,n3;
      char carr[10];

      Public:
             ABC();
      ABC(int arr[],char car[],int n,int n1)
      {
              n2=n; n3=n1;
              for(int i=0;i<n;i++)
              iarr[i]=arr[i];
              for(int i=0;i<n1;i++)
                      carr[i]=car[i];
      }

      ABC operator>>(int n)
      {
          while(n)
          {
                  int temp;
                  temp=iarr[n2-1];
                  for(int i=n2-1;i>=0;i--)
                  {
                      iarr[i]=iarr[i-1];
                  }
                  iarr[0]=temp;
          }
      }

      void display()
      {
          for(int i=0;i<n2;i++)
              printf("%d\t",iarr[i]);
          printf("\n");
          for(int i=0;i<n3;i++)
              printf("%d\t",carr[i]);
      }
};

main()
{
    ABC A;
    A=ABC(arr,car,n,n1);
    A.display();
}

The proper way to construct an element using a non-default ctor is ABC A(arr, carr, n, n1); If you write ABC A; A = ABC(...); you'll need a default ctor and an assignment operator. — dyp
– dyp, Commented Oct 8, 2013 at 10:54
You're not modifying n inside operator>>, so this loop while(n) will either not run at all or run infinitely. — dyp
– dyp, Commented Oct 8, 2013 at 11:04

Isaac Bhasme · Accepted Answer · 2013-10-08 11:09:34Z

2

Your error "invalid use of undefined type 'class ABC'" is because of your default constructor. You have declared a default constructor, but you have not defined it.

Instead of ABC(); you need to atleast do ABC() {}

edited Oct 8, 2013 at 11:09

answered Oct 8, 2013 at 10:38

Isaac Bhasme

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1 Comment

Maverick Over a year ago

After wasting about 45 mins...phew!!.'P' should not be capital in 'Public'. But compiler wasn't giving any error for this. Remaining code is correct except 'n--' in while loop.

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