fixing project

#include <iostream> #include <string> using namespace std; //Product class class Product { public: string name; float price; Product *next; }; //Customer class class Customer { public: string firstname; string lastname; string type; Customer *next; Product item; Customer(); }; Customer::Customer() { firstname=""; lastname=""; type=""; item.name=""; item.price=0.0; } int main() { Customer* addNewCust(Customer *); string delCust(Customer *,string); string addProduct(Customer *,string,string,float); string delProduct(Customer *,string); void printCustDetails(Customer *); string delAllProduct(Customer *); Customer* delAllCust(Customer *); Customer *db = NULL; Customer *head=NULL; Customer *curr=NULL; db = new Customer; if(!head) { head = new Customer; curr = head; } else { curr = head; while(curr -> next) curr = curr -> next; } db->next = head; head->next = NULL; int option; char ch; do { cout<<"\n Please select any item from the following menu:"<<endl; cout<<"1: Add a new customer in the list."<<endl; cout<<"2: Delete a customer from the list."<<endl; cout<<"3: Add a product in the list of currently bought products of a customer."<<endl; cout<<"4: Delete a product from the list of products of a customer."<<endl; cout<<"5: Print all the customers along with their list of products."<<endl; cout<<"6: Delete all the products of a particular customer."<<endl; cout<<"7: Delete all the customers from the list."<<endl; cout<<"\n Enter Menu Option [1-7] : "; cin>>option; string fname; string pname; float price; switch(option) { case 1: curr = addNewCust(curr); break; case 2: cout<<"Enter Customer First name: "; cin>>fname; cout<<delCust(head,fname); break; case 3: cout<<"Enter Customer First name: "; cin>>fname; cout<<"Enter Product Name: "; cin>>pname; cout<<"Enter Product Price: "; cin>>price; cout<<addProduct(head,fname,pname,price); break; case 4: cout<<delProduct(head,fname); break; case 5: printCustDetails(head); break; case 6: delAllProduct(head); break; case 7: head = delAllCust(head); break; default: cout<<"Enter Option from the list [1-7]"; break; } cout<<"\n Do you wish to continue: (y/n)"; cin>>ch; }while(ch!='n'); return 0; } Customer* addNewCust(Customer *cur) { Customer *c; c = new Customer(); cur->next = c; string f,l; cout<<"Adding New Customer"<<endl; cout<<"Enter First Name:"; cin>>f; cout<<"Enter Last Name:"; cin>>l; c->firstname = f; c->lastname = l; c->next = NULL; c->item.name = " "; return c; } string delCust(Customer *hd,string fname) { cout<<"Deleting Customer"<<endl; while(hd) { if(hd->firstname.compare(fname)) { //free(hd); cout<<hd->firstname; hd=NULL; return "\nCustomer deleted!!"; } else hd = hd->next; } return "\nNo Customer Found"; } string addProduct(Customer *hd,string fname,string pname, float price) { cout<<"Adding New Product"<<endl; while(hd) { if(hd->firstname.compare(fname)) { hd->item.name = pname; hd->item.price = price; return "\nProduct added!!"; } else hd = hd->next; } return "\nCustomer not found"; } string delProduct(Customer *hd, string fname) { cout<<"Delete Product"<<endl; while(hd) { if(hd->firstname.compare(fname)) { hd->item.name = " "; hd->item.price = 0.0; return "\nProduct deleted!!"; } else hd = hd->next; } return "\nCustomer not found"; } void printCustDetails(Customer *hd) { cout<<"Printing Customer and Product"<<endl; if(hd->next==NULL) { cout<<"No Data to print"; return; } string f,l; string type="normal"; string pname; float price; cout<<"\n Customer Details "<<f<<" "<<l; while(hd) { f = hd->firstname; l = hd->lastname; cout<<f<<" "<<l; while(hd->item.price!=0.0) { if(hd->item.price > 1000) type = "excellent"; else if((hd->item.price < 1000) && (hd->item.price >100)) type = "good"; else type = "normal"; cout<<"Type :"<<type; pname = hd->item.name; price = hd->item.price; cout<<"\n Products "<<"Name "<<pname<<"Price"<<price; hd->item.next = hd->item.next; break; } hd = hd->next; } } string delAllProduct(Customer *hd) { cout<<"Delete All Products"<<endl; if(hd==NULL) cout<<"No product to delete"; while(hd) { string f = hd->firstname; string l = hd->lastname; cout<<"\n Customer Details: "<<f<<" "<<l; while(hd->item.name!=" ") { hd->item.name =" "; return "\nItems deleted"; break; } hd = hd->next; } return "\n No items to delete for customer"; } Customer* delAllCust(Customer *hd) { cout<<"Delete All Customer"<<endl; hd=NULL; cout<<"All Customer deleted"; return hd; }