DSA Assignment 1

#include <iostream>
using namespace std;

class singlerecord
{  public:
   int key;
   long int ph_num;
   string name;
   singlerecord()
   {
  key=-1;
  ph_num=-1;
  string name;
   }
   void upd(int k,string nam,long int phu)
   {
  key=k;
  name=nam;
  ph_num=phu;
   }
};

 class hashtable
{
public:
singlerecord rec[10];
long long int ph_num;
string name;
int index,i,j;
int counter;
long long int phone;

void insert()
{
cout<<"\nEnter student name:";
cin>>name;
cout<<"\nEnter phone number:";
cin>>phone;

index=phone%10;
int counter =0;
while(rec[index].key!=-1)
{
index=(index+1)%10;

counter++;
if(counter>10)
return;

}

rec[index].upd(counter,name,phone);

  }
  void display(){
  for(i=0;i<10;i++)
  {
  cout<<rec[i].key<<" - "<<rec[i].name<<"  "<<rec[i].ph_num<<endl;
  }
  }


 void searching(){
cout<<" \n Enter phone Number";
cin>>phone;
int j=0;
for(j=0;j<10;j++)
{
if(phone==rec[j].ph_num)
{cout<<"\nrecord found at"<<endl;
   cout<<rec[j].key<<" - "<<rec[j].name<<"  "<<rec[j].ph_num<<endl;}
}
if(j==10)
cout<<"Record not found"<<endl;
 }

void del(){
cout<<"\n Enter phone number";
cin>>phone;
int j=0;
for(j=0;j<10;j++)
{
if(phone==rec[j].ph_num)
{
  rec[j].key=-1;
  rec[j].ph_num=-1;
  rec[j].name="";
  break;
}
if(j==10)
cout<<"Record not found to delete"<<endl;
}
}

};

int main()
{
hashtable h;

int choice=0;

do
{
cout<<"Enter 1 to insert a data item";
cout<<"\nEnter 2 to delete a data item";
cout<<"\nEnter 3 to display data item";
cout<<"\nEnter 4 to search data item";
cout<<"\nEnter 0 to exit\n";
cin>>choice;

switch(choice)
{
case 1:
h.insert();
break;
case 2:
h.del();
break;
case 3:
h.display();
break;
case 4:
h.searching();
break;
default:
cout<<"You entered a wrong choice";
break;
}

    }while(choice!=0);

return 0;
}