Perform insert, delete, merge and delete multiple occurrences of a number from an array

# include <iostream.h>
# include <conio.h>
# include <process.h>

int display_menu();
int array_no=1; //CURRENT ARRAY 1 OR 2
class array
{
 int arr[20];
 int n;
 public:
    array()
    {
     n=0;
    }
    void add_n(int);
    int getval(int);
    int getsize();
    void getelements();
    void display();
    void insert();
    void delete_element();
    void merge_array(array);
};

int array :: getsize()
{
 return n;
}
void array :: add_n(int x)
{
 n=n+x;
}
int array :: getval(int i)
{
 return (arr[i]);
}
void array :: getelements()
{
  cout<<\"Enter Number of elements you want to enter :\";
  cin>>n;
  for(int i=0;i<n;i++)
  {
   cout<<\"a[\"<<i<<\"] :=>\";
   cin>>arr[i];
  }
}

void array :: display()
{
  cout<<endl;
  if(n==0)
  {
   cout<<endl<<\"No Element !!!\"<<endl;
  }

  for(int i=0;i<n;i++)
  {
    cout<<\"a[\"<<i<<\"] :\"<<arr[i]<<endl;
  }
}

void array :: insert()
{
  display();
  int pos;
  cout<<endl<<\"[Enter Number Between 0 \"<<\"And \"<<n<<endl;;
  cout<<endl<<\"Enter Position Where you want to Insert :\";
  cin>>pos;
  if(pos < 0 || pos >n)
  {
   cout<<\"Out of Range !!!\";
  }
  else
  {
  for(int i=n;i>pos;i--)
  {
   arr[i]=arr[i-1];
  }
  cout<<\"Enter Number :\";
  cin>>arr[pos];
  cout<<\"Number Inserted at the Position \"<<pos<<endl;
  n=n+1;
  }
}

void array :: delete_element()
{
  display();
  //Delete Multiple Occurance of a Number in an Array
  int no,i,pos,j;
  cout<<endl;
  cout<<\"Enter Number to Delete :\";
  cin>>no;

  for(i=0;i<n;i++)
  {
   pos=i;
   if(arr[i]==no)
   {
    for(j=pos;j<n-1;j++)
    {
     arr[j]=arr[j+1];
    }
    n=n-1;
    i--;
   }
  }
}

void array :: merge_array(array a1)
{
  for(int i=0;i<a1.getsize();i++)
  {
    arr[i+n]=a1.getval(i);
  }
  add_n(a1.getsize());
  cout<<\"Second Array merged with current array ...\";
}






void main()
{
 clrscr();
  array a1,a2;
 int arr_no;
 while(1)
 {
 switch(display_menu())
 {
  case 1: cout<<\"Select Array  [ 1 Or 2 ]\";
      cin>>arr_no;
      if(arr_no==1 || arr_no==2)
      {
       array_no=arr_no;
      }
      else
      {
       cout<<\"Invalid Number entered !!!!\";
       getch();
      }
      break;
  case 2 : if(array_no==1)
       {
        a1.getelements();
       }
       else
       {
        a2.getelements();
       }
       break;
  case 3 : if(array_no==1)
       {
         a1.insert();
       }
       else
       {
         a2.insert();
       }
       getch();
       break;
  case 4 : if(array_no==1)
       {
         a1.delete_element();
       }
       else
       {
        a2.delete_element();
       }
       getch();
       break;

  case 5 : if(array_no==1)
       {
        a1.display();
       }
       else
       {
        a2.display();
       }
       getch();
       break;









  case 6 : if(array_no==1)
       {
         a1.merge_array(a2);
       }
       else
       {
         a2.merge_array(a1);
       }
       getch();
       break;
  case 7 : exit(1);
 }
 }
}

int display_menu()
{
  int ch;
  clrscr();
  cout<<endl<<\"\\t\\t\\t[ Current Array is :\"<<array_no<<\"]\"<<endl;
  cout<<\"\\t\\t\\t| 1 | - Select Array\"<<endl;
  cout<<\"\\t\\t\\t| 2 | - Enter Elements\"<<endl;
  cout<<\"\\t\\t\\t| 3 | - Insert\"<<endl;
  cout<<\"\\t\\t\\t| 4 | - Delete\"<<endl;
  cout<<\"\\t\\t\\t| 5 | - Display\"<<endl;
  cout<<\"\\t\\t\\t| 6 | - Merge Second Array\"<<endl;
  cout<<\"\\t\\t\\t| 7 | - Exit\"<<endl;
  cout<<\"\\t\\t\\tEnter Your Choice :\";
  cin>>ch;
  return(ch);
}