Need help with understanding the question

[luv2program]

So stuck please help me understand what to do in this situation

Modify the lookUpBook() function such that it will prompt for the title then
search this value in the book title array. If not found, display a message for
user. If found, call the bookInfo() function and display all information for this
title.

In addition, allow look up to occur if only part of the title is given. In this
case, you may use the strstr() function. You might make this feature a function
as it will be needed again below.

#include <iostream>
#include <iomanip>
using namespace std;

void cashier(); // 1.
void invMenu(); // 4.
void report(); // 7.
void bookInfo(char *title[51],char *isbn[14],char *author[],char *publisher[],char *date[11],int quantity, double wholesale, double retail); // 10.
// 12.
void lookUpBook();
void addBook();
void editBook();
void deleteBook();
// 15.
void repListing();
void repWholesale();
void repRetail();
void repQty();
void repCost();
void repAge();
int searchList();

char bookTitle[20][51];
char isbn[20][14];
char author[20][31];
char publisher[20][31];
char dateAdded[20][11];
int qtyOnHand[20];
double wholesale[20];
double retail[20];
const double TAX_RATE=.06;

int main()
{
     char choice;
     //Task 4

     cout << "\n\tABC Bookstore";
     cout << "\n\t  Main Menu ";
     cout << "\n\n";
     cout << "\n1. " << "Cashier Module";
     cout << "\n2. " << "Inventory Base Module";
     cout << "\n3. " << "Report Module";
     cout << "\n4. " << "Exit";
     cout << "\n\n";
     cout << "\nEnter your choice :";
     cin >> choice;
               
     while(choice != '1' && choice != '2' && choice != '3' && choice != '4'){
         cout << "\nEntries must be between 1 and 4 inclusively.";
         cout << "\n\nEnter your choice :";
         cin >> choice;
     }          
     
     cout << "\nYou selected item " << choice;
     cout << "\n\n";
     
     switch(choice) 
     {
         case '1' : // 3.
              cashier();
              break;
         case '2' : // 6.
              invMenu();
              break;
         case '3' : // 9.
              report();
              break;
     }      
     system ("PAUSE");
     return 0;      
}

void cashier() // 2.
{
     string date, isbn, title;
	 int quantity;
	 float price, subtotal,tax,total;
	 
	 //get input
	 cout<<"Enter the Book's title: "<<endl;
	 getline(cin,title);
	 cout<<"Please enter the date: "<<endl;
	 cin>> date;
	 cout<<"Enter the quantity: "<<endl;
	 cin>>quantity;
	 cout<<"Enter the book's ISBN: "<<endl;
	 cin>>isbn;
	 cout<<"Enter the price of the book: "<<endl;
	 cin>>price;
	 
	 //calculate total
	 subtotal=price*quantity;
	 tax= subtotal*.06;
	 total=tax+subtotal;
	 
     //Display cashier slip
	 cout<<"\t\tABC Bookstore\t\t"<<endl;
	 cout<<"Date: "<<date<<endl;
	 cout<<"\nQty \t ISBN \t\t Title \t\t Price \t Total"<<endl;
	 cout<<"____________________________________________________________"<<endl;
	 cout<<setw(2)<<quantity<<setw(15)<<isbn<<setw(20)<<title<<setw(8)<<price<<setw(8)<<subtotal<<endl;
	 cout<<"\n\n";
	 cout<<"\t\t\t\t\tSubtotal: $"<<subtotal<<endl;
	 cout<<"\t\t\t\t\tTax (6%): $"<<tax<<endl;
	 cout<<"\t\t\t\t\tTotal : $"<<total<<endl;
}

void invMenu() // 5.
{
     char choice;
      
     cout << "\n\t\tABC Bookstore";
     cout << "\n\t    Inventory Database Menu ";
     cout << "\n\n";
     cout << "\n1. " << "Look up a book";
     cout << "\n2. " << "Add a book";
     cout << "\n3. " << "Edit a book's record";
     cout << "\n4. " << "Delete a book";
     cout << "\n5. " << "Return to the main menu";
     cout << "\n\n";
     
     cout << "\nEnter your choice: ";
     cin >> choice;
     
     while( choice != '1' && choice != '2' && choice != '3' && choice != '4' && choice != '5' ){
         cout << "\nEntries must be between 1 and 5 inclusively.";
         cout << "\n\nEnter your choice :";
         cin >> choice;
     }
     
     addBook();
     cout << "\nYou selected item "<< choice;
     cout << "\n\n";
}

void report() // 8.
{
     char choice;

	 //Display menu
	 cout<<"\t\tABC Bookstore\t\t"<<endl;
	 cout<<"\t\tReports Menu\t\t"<<endl;
	 cout<<"\n\n";
	 cout<<"1. Inventory Listing"<<endl;
	 cout<<"2. Inventory Wholesale Value"<<endl;
	 cout<<"3. Inventory Retail Value"<<endl;
	 cout<<"4. Listing by Quantity"<<endl;
	 cout<<"5. Listing by Cost"<<endl;
	 cout<<"6. Listing by Age"<<endl;
	 cout<<"7.Return to Main Menu"<<endl;
 	
 	 //get choice
	 cout<<"Enter your choice: "<<endl;
	 cin>>choice; 

	 //input validation
	 while(choice!='1' && choice!='2' && choice!='3' && choice!='4' && choice!='5' && choice!='6' && choice!='7')
	 {
 	   	cout<<"Entries must be between 1 and 9 inclusively."<<endl;
		cout<<"Enter your choice: "<<endl;
		cin>>choice;
	 }

	 //Display the entry made
	 cout<<"You selected item "<< choice<<endl;
}
//task 5 
void bookInfo(char *title[51],char *isbn[14],char *author[],char *publisher[],char *date[11],int quantity, double wholesale, double retail) //11.
{
     cout << "\t\tABC Bookstore";
     cout << "\n\t\tBook Information";
     cout << "\n\nISBN : ";
     cout << "\nTitle : ";
     cout << "\nAuthor : ";
     cout << "\nPublisher : ";
     cout << "\nDate Added : ";
     cout << "\nQuantity on Hand : ";
     cout << "\nWholesale Cost : ";
     cout << "\nRetail Price : ";
     cout << "\n\n";
}
// 13.
void lookUpBook()
{
     cout << "this is look up book" << endl;
}
void addBook()
{
     int bookResult = searchList(); 

        
        if (bookResult == -1)
                cout << "books cannot be added to inventory" << endl;
        
        }
}
void editBook()
{
     cout << "this is edit book" << endl;
}
void deleteBook()
{
     cout << "this is delete book" << endl;
}         

// 16.
void repListing()
{
     cout << "this is rep listing" << endl;
}

void repWholesale()
{
     cout << "this is rep wholesale" << endl;
}

void repRetail()
{
     cout << "this is rep retail" << endl;
}

void repQty()
{
     cout << "this is rep qty" << endl;
}

void repCost()
{
     cout << "this is rep cost" << endl;
}

void repAge()
{
     cout << "this is rep age" << endl;
}

int searchList()
{
        int position = -1;
        int index = 0;

        while (index < 20)
        {
                if (bookTitle[index][0] == 0) 
                {
                    position = index;
					break;
                }
     index++;
        }
        
		return position;
}

[MathNerd]

enable pm

[luv2program]

i enabled