i am gettin an Error Identifier 'display' cannot have a type qualifier in function cu

[Akshay143]

#include <stdio.h>
#include <conio.h>
#include <string.h>
#include <process.h>
#include <ctype.h>
 
#include <fstream.h>
 
class customer
{
      char ph[10];
      char name[30];
      char add[40];
      char type;
      public :
      void append();
      void display();
      void del();
      void modify();
      void list();
      void help();
}cust;
 
 
 
void customer::append()
{
      char choice;
      fstream f;
      f.open("tphone.dat", ios::app);
      if (!f)
      { cout<<"\n  Unable to open FILE.";
      getch();
      return;
      }
      while(1)
      { clrscr();
cout<<"\n\n***********************************************************************";
cout<<"\n                                                  CUSTOMER RECORD";
cout<<"\n\n***********************************************************************";
     while(1)
        {   cout<<"\n\tEnter the name";
             cout<<"\nName              :   ";
                         gets(name);
             if(strlen(name)==0)
 
         cout<<"\n\n\tName cannot be left blank\a\a";
                                      else
             break;
             }
                    while(1)
      { cout<< "\n\tEnter the address";
             cout<<"\n    Address                           :   ";
                        gets(add);
             if (strlen(add) != 0)
             break;
             }
 
          while(1)
      {     cout<<"\nEnter TelePhone. No.     :   ";
                cin>>ph;
             if (ph != 0 )
             break;
             else
             {
             cout<<"\n\n\tTelePhone no. cannot be left blank\a\a";
             }
             }
  while(1)
{    cout<<    "Enter O for Office and R for residential phone";
 
      cout<<"catagory ( O/R )  :   ";
      cin>>type;
if (type=='o'||type=='O'||type=='r'||type=='R')
            break;
else{cout<<"\n   Wrong choise...";
}
}
cout<<"\n\n**********************************************************************";
cout<<"\n 1 :                        Save & Exit    2 :  Save & Cont.   0 : Exit without save";
cout<<"\n\n**********************************************************************";
      cin>>choice;
      switch(choice)
      {
             case ('1') :      f.write((char *) this,sizeof(cust));
                    f.close();
                    return;
             case ('2') :     f.write((char *) this,sizeof(cust));
                    break;
             case ('0') :   f.close();
                    return;
             default :      f.close();
                    return;
      }
      }
 
void customer :: display()
{
      char p[10];
      char choice;
      int found=0;
      int no;
     long float bill=0.0, tax=0.0, bbill=0.0,rent;
      fstream f;
      f.open("tphone.dat", ios::in);
      if (!f)
      { cout<<"Unable to open a file";
         getch();
         f.close();
         return;
      }
      while(choice != '0')
      {
      clrscr();
            cout<<"Please enter the Phone No. ";
      cin>>p;
      if (!strcmp(p,"0"))
             return;
      found = 0;
      f.seekg(0);
      while (f.read((char *)this ,sizeof(cust)))
      {
             if (found==1)
             break;
             if (!strcmp(ph,p))
             {
             clrscr();
cout<<"\n\n===================================================";
 cout<<"\n\t                                               TELEPHONE BILL";
cout<<"\n\n===================================================";
             cout<<"\n\n    Name   :- \t           ";
             cout<<name;
                                     cout<<"\n    Address   :-  \t        ";
             cout<<add;
             cout<<"\n    TelePhone No.   :- \t     ";
             cout<<ph;
             cout<<"\n    Catagory ( O/R )   :- \t ";
             cout<<type;
                                      cout<<"\nNo. of calls   :- \t     ";
             cin>>no;
             if ( no<=150)
              {if (toupper(type) == 'O')
                 { bill=0;
                rent=150;  }
            else
            bill=0;rent=200;}
                                                if( no>150)
                 {  no = no - 150;
             if (toupper(type) == 'O')
                {   bill =(no * 1.00) ;  rent=150;
              }
             else
                    {bill = (no * .80);
            rent=200;
             }}
                                                    cout<<"\n=====================================================";
             cout<<"\n      Charge :";
                      cout<<bill;
                                                 tax = (5*bill)/100;
                         cout<<"\n       Service tax(5% ):  Rs ";
                         cout<<tax;
                        cout<<"\n       Rent :-  \nRs ";
                        cout<<rent;
cout<<"\n--------------------------------------------------------------------------------------------";
 
             cout<<"\n\n\tTOTAL BILL :  Rs " ;
                 bbill = bill+tax+rent;
                 cout<<bbill;
cout<<"\n======================================================";
             found = 1;
          cout<< "\n Press a Key to continue";
             getch();
             }
      }
cout<<"\n=====================================================";
      cout<<"\n\n  1 :  Cont.     0 : Exit ";
cout<<"\n=====================================================";
      cin>>choice;
      switch(choice)
      {
             case ('1') :
             break;
             case ('0') : return;
             default : return;
      }}
      f.close();
}
void customer :: list()
{
      clrscr();
      fstream fp;
      int r;
      fp.open("tphone.dat", ios::in);
      if (!fp)
      {
      cout<<"Unable to open";
      getch();
      fp.close();
      return;
      }
      gotoxy(35,2);
      cout<<"List of Customers";
      gotoxy(35,3);
      cout<<"*****************";
      gotoxy(5,4);
      cout<<"Name";
      gotoxy(40,4);
      cout<<"Phone No.";
      gotoxy(65,4);
      cout<<"Catagory";
      gotoxy(1,5);
      cout<<"**************************************************************************";
      r=6;
      while (fp.read((char *) this, sizeof(cust)))
      {
      if (r >= 21)
      {
 
             getch();
             clrscr();
             gotoxy(35,2);
             cout<<"List of customers";
             gotoxy(35,3);
             cout<<"*****************";
             gotoxy(5,4);
             cout<<"Name";
             gotoxy(40,4);
             cout<<"Phone No.";
             gotoxy(65,4);
             cout<<"Catagory";
             gotoxy(1,5);
             cout<<"***************************************************************************";
             r=6;
      }
      gotoxy(5,r);
      cout<<name;
      gotoxy(40,r);
      cout<<ph;
      gotoxy(65,r);
      if (toupper(cust.type) == 'O')
             cout<<"Office";
      else
             cout<<"Residential";
      r++;
      }
      cout<<"\n\n\nPress any key to continue ...";
      getch();
      fp.close();
}
void customer :: del()
{
      char ch;
      char p[10];
      fstream tp,f;
      f.open("tphone.dat", ios::in);
      if (!f)
      {
      cout<<"Unable to open Telephone file";
      getch();
      f.close();
      return;
      }
      tp.open("temp.dat", ios::out);
      if (!tp)
      {cout<<"Unable to open Temporary file";
      getch();
      tp.close();
      return;
      }
      clrscr();
cout<<"\n\n***********************************************************************";
      cout<<"\n   Enter the Phone No. to be deleted         : ";
      cin>>p;
      if(!strcmp(p,"0"))
      return;
      int found=0;
      while (f.read((char *) this, sizeof(cust)))
      {
      if (!strcmp(p,ph))
      {
             found = 1;
                    cout<<"\n   Name        :              "<<name;
                  cout<<"\n   Address    :         " <<add;
                    cout<<"\n   Catagory   :       "<<type;
cout<<"\n\n***********************************************************************";
                 cout<<"\n\n     Delete this record (Y/N)   ";
                  cin>>ch;
             if (toupper(ch) == 'N')
             tp.write((char *) this,sizeof(cust));
      }
      else
             tp.write((char *) this,sizeof(cust));
      }
      f.close();
      tp.close();
      if (toupper(ch) == 'N')
      return;
      if (!found)
      {
      cout<<"\n\nTelephone no. not found";
      getch();
      return;
      }
      f.open("tphone.dat", ios::out);
      tp.open("temp.dat", ios::in);
      while (tp.read((char *) this, sizeof(cust)))
      f.write((char *) this, sizeof(cust));
      f.close();
      tp.close();
}
 
void customer :: modify()
{
      char ch;
      char p[10];
      fstream tp,f;
      f.open("tphone.dat", ios::in);
      if (!f)
      {
      cout<<"\n   Unable to open Telephone file";
      getch();
      f.close();
      return;
      }
      tp.open("temp.dat", ios::out);
      if (!tp)
      {
      cout<<"\n   Unable to open Temporary file";
      getch();
      tp.close();
      return;
      }
      clrscr();
cout<<"\n\n***********************************************************************";
      cout<<"\n   Enter the Phone No. to be Modify : ";
      cin>>p;
      if(!strcmp(ph,"0"))
      return;
      int found=0;
      while (f.read((char *) this, sizeof(cust)))
      {
      if (!strcmp(p,ph))
      {
             found = 1;
cout<<"\n\n***********************************************************************";
             cout<<"\n\n    Name       "<<name;
                    cout<<"\n    Address    " <<add;
                  cout<<"\n    Catagory   "<<type;
cout<<"\n\n**********************************************************************";
        cout<<"\n\n       Modify this record (Y/N) ";
             cin>>ch;
             if (toupper(ch) == 'Y')
             {
cout<<"\n\n***********************************************************************";  cout<<"\n    CUSTOMER RECORD";
cout<< "\n    Enter the customer record";
             while(1)
             {
                                        cout<<"\n\n   Name              :   ";
              gets(name);
              if (strlen(name) != 0)
                          break;
             }
                                      cout<<"\n   Address           :   ";
             gets(add);
             while(1)
             {
                                      cout<<"\n   Assigned Ph. No.  :   ";
                         cin>>ph;
             if (ph != 0 )
                         break;
             }
 
{    cout<<    "Enter O for Office and R for residential phone";
        cout<<"catagory ( O/R )  :   ";
        cin>>type;
} } }
      tp.write((char *) this,sizeof(cust));
      }
      f.close();
      tp.close();
      if (toupper(ch) == 'N')
      return;
      if (!found)
      {
          cout<<"\n\n    Telephone no. not found....!!";
          getch();
          return;
      }
      f.open("tphone.dat", ios::out);
      tp.open("temp.dat", ios::in);
      while (tp.read((char *) this, sizeof(cust)))
      f.write((char *) this, sizeof(cust));
      f.close();
      tp.close();
}
 
void customer :: help()
{
      clrscr();
cout<<"\n\n***********************************************************************";
cout<<"\n\n***********************************************************************";
      cout<<"\n\n   This program is used to create a telephone bill for the customers. ";
      cout<<"\n   There are two categories of the customers. First categories is  of";
      cout<<" \n    Residential phones and second categories is of Office phones. Both";
      cout<<"\n   the categories have different charges of the telephone bill. Charges";
      cout<<"\n   of residential phones are 80 Paisa per call and Charges of Office ";
      cout<<"\n   office phones are Rs. 1 per call. 150 call are free for each category";
      cout<<"\n   Total bill for is equal to 5% tax plus and there is a fixed monthly charge ";
      cout<<"\n   called rent for Office customers rent is Rs.150 and for Residential customers it is Rs.200.  ";
 cout<<"\n CREATED BY-\n\t  Anmol Shrivastava , Ankit Puri  & Manish Pandey";
cout<<"\n\n***********************************************************************";
cout<<"\n\n***********************************************************************";
getch();
}
void main()
{
clrscr();
 char pass[10];
     cout<<"enter your password "<<endl;
     for(int i=0;i<5;i++)
     {
    pass[i]=getch();
    cout<<"*";
     }
 if(strcmp(pass,"password")==0)
{
 
     cout<<endl;
 
      char ch,ch1;
      while(1)
      {
 
cout<<"****************************************************************************";
cout<<"\n\t\t\t                    BHARAT SANCHAR NIGAM LIMITED (B.S.N.L)";
cout<<"\n\n***********************************************************************";
 
                         cout<<"\n\n\n\n\n\t\t  D    -    Display a Bill";
             cout<<"\n\n\t\t  L    -    List of customers";
             cout<<"\n\n\t\t  H    -    Help";
             cout<<"\n\n\t\t  R    -    Enter \ Modify a record";
             cout<<"\n\n\t\t  Q    -    Quit";
             cout<<"\nEnter your choise   :";
 
     cin>>ch;
      ch = toupper(ch);
      switch(ch)
      {
      case ('Q') :clrscr();
cout<<"***************************************************************************";
cout<<" \n\n\t         Thank you for using Hybrid telephone billing program\n\n\n";                           cout<<"Good Bye \n\n\t";
cout<<"\n\n\n                  CREATED BY-  Ankit Puri ,  Anmol Shrivastava  &  Manish Pandey ";
cout<<"\n\n***********************************************************************";
                getch();
                exit(0);
      case ('D') : cust.display();
                 break;
      case ('L') : cust.list();
                 break;
      case ('H') : cust.help();
                 break;
      case ('R') :
             ch1 = 'A' ;
             while(ch1 != 'Q')
             {
                    clrscr();
cout<<"***************************************************************************";cout<<"\n\n\t\t\t            BHARAT SANCHAR NIGAM LIMITED (B.S.N.L)";
cout<<"\n\n***********************************************************************";
 
 cout<<" \n\n\t     A    -    Append a record";
 cout<<"     \n\t     D    -    Delete a record";
 cout<<"     \n\t     M    -    Change a record";
 cout<<"       \n\t     Q    -    Quit";
 cout<< "\n\n\tSelect your choice :- ";
cout<<"\n\n***********************************************************************";
            cin>> ch1;
                    ch1 = toupper(ch1);
                    switch(ch1)
                    {
                    case ('A') : cust.append();
                        break;
                    case ('D') : cust.del();
                        break;
                    case ('M') : cust.modify();
                        break;
                                             }
             }
                             }
 

}

[weaknessforcats]

There are several errors in the code. The biggest one is not including iostream.h. I also found the member function customer::append() is missing a closing brace.

I also received many other warnings due to using the pre-1998 C++ headers, like fstream.h.

I recommend using a newer compiler.