can anybody help me to debug the error?with this..

#include<iostream>
#include<conio.h>
#include<string.h>
#include<stdlib.h>
#include<iomanip>

using namespace std;
main(){
       
       FILE *ptr;
       FILE *tptr;
       char wb[100];
       int idn, sidn,idFromFile;
       int ch, xidn;
       char menu;
       bool exist;
       
       system("cls");
        
       cout<<"Menu\n\n";
       cout<<"1. add\n";
       cout<<"2. view\n";
       cout<<"3. del\n";	   
	   cout<<"Choice: "; 
       cin>>ch;
	   
	   switch (ch){
              case 1:
                   {
                   ptr = fopen("add.txt", "a+");
                   if(ptr == NULL)
                          {
                          cout<<"\n\nFILE COULD NOT BE OPENED!";
                          }
                   else{
                        
                       /* the error start here*/
                        ifstream ViewLogin(ptr);
                        
                        cout<<"\nID: ";
                        cin>>idn; 
                        //cin.ignore(); //xidn = ptr.idn;
                        getline(ViewLogin, idnFromFile);
                        while(idn == idnFromFile)
                        {
                                  cout<<"\nID EXIST!";
                                  cout<<"\nID: ";
                                  cin>>idn;           
                        }
                        //if(
                        cout<<"\twebsite: "; cin>>wb;  
                        fprintf(ptr,"%d\n%s\n", idn, wb);
                        fclose(ptr);                        
                        }
                                 getch();
                                 goto repeat;
                    }                        
              case 2:
                   {
                   ptr = fopen("add.txt", "r");
                   if(ptr == NULL){
                          cout<<"\n\nFILE COULD NOT BE OPENED!";
                          }
                   else{
                        char xwb[100];
                        int xidn;
                        cout<<"Search ID: "; cin>>sidn;
                        
                        while(!feof(ptr)){
                                          fscanf(ptr,"%d%s\n", &idn, wb);
                                        if(sidn == idn){
                                                 xidn = idn;
                                                 strcpy(xwb, wb); 
                                                
                                                 }
                                        else{
                                             cout<<"ID NOT EXIST!";
                                             }
                        } 
                        cout<<"\nInfo\n";
                        cout<<"ID:"<<"\t"<<xidn<<endl;
                        cout<<"Website: "<<"\t\t"<<xwb<<endl;
                                
                        fclose(ptr);          
                      
                        }                                                
                   getch();
                   goto repeat;
                   }    
                        
             case 3:
                        {
                        ptr = fopen("add.txt", "r");
                        int del;
                        if(ptr == NULL){
                               cout<<"\n\nFILE COULD NOT BE OPENED!";
                               }
                        else{
                             
                        while(!feof(ptr))
                        {
                             fscanf(ptr,"%d%s\n", &idn, wb);
                                                              
                        cout<<"Info\n";
                        cout<<"ID:"<<"\t\t\t"<<idn<<endl;
                        cout<<"website: "<<"\t\t"<<wb<<endl;
                       
                          }
                             cout<<" delete all records? 1 - YES, 2 - NO\n"; 
                             cin>>del;
                             if(del == 1){
                                    ptr = fopen("add.txt", "w");
                                    if(ptr == NULL){
                                           cout<<"\n\nFILE COULD NOT BE OPENED!";
                                           }
                                    else{
                                         fprintf(ptr,"");
                                         }
                                    }
                             else if(del == 2){
                                               goto repeat;
                                               }
                             else{
                                  cout<<"Wrong Input!";
                                  goto repeat;
                                  }
                                  fclose(ptr);
                                  }
                             getch();
                             goto repeat;
                             }                  
                   //case 4:
                    default:
                            {
                            cout<<"Wrong choice!";
                            getch();
                            
                            goto repeat;
                            }}
                            
                    repeat:
                    cout<<"\nReturn to Main Menu? [Y/N]";
                    cin>>menu;
                    if((menu == 'Y')||(menu == 'y')){
                             return main();
                             }
                    if((menu == 'N')||(menu == 'n')){
                             return 0;
                             }
getch();
}