Can anybody tell me why I'm getting these errors?

[3UMLy60M]

This program starts out with authors and book titles initialized to NONE and prices initialized to $0. The user is then allowed to input all of the information and the program outputs it back at the end.

When I try to run the program I get this error message in lines 39, 42, and 45:
- error C2056: 'catalogue' : undeclared identifier

Can anybody tell me what I'm doing wrong? This is my code:

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

//Structure to hold the book information for an author
struct BookInfo
{
	string title;
	double price;

        BookInfo() {
                title = "NONE";
                price = 0;
        }
};

//Structure to hold the author and their book information
struct Author
{
	string author;
	BookInfo books[3];

        Author() { 
                author = "NONE"; 
        }
};

//Function Prototypes
void showInfo(Author a[], int size);
void getInfo(Author a[], int size);

int main()
{
	int index = 3;

	cout << "Here is the data after initialization:\n";
	showInfo(catalogue,index); //Displays the data in the author structure called catalogue

	cout << "\nGet user's input:";
	getInfo(catalogue,index); //Allows the user to enter data in the author structure called catalogue

	cout << "\nHere is the data after the user's input:";
	showInfo(catalogue,index);  //Displays the data in the author structure called catalogue

	system("pause");
	return 0;
}

void showInfo(Author a[], int size) //Uses nested for loops to display the information contained in the catalogue
{
	cout << fixed << showpoint << setprecision(2); //Sets the formatting used for doubles

	for(int x = 0; x < size; x++)
		{
			cout << "The author: " << a[x].author << endl;
		
			for(int y = 0; y < size; y++)
				{
					cout << "\tThe title: " << a[x].books[y].title << ", the price: $" << a[x].books[y].price << endl;
			}
	}
}

void getInfo(Author a[], int size) //Uses nested for loops to read data into the catalogue
{
	
	for(int x = 0; x < size; x++)
		{
			cout << "\nEnter the author's name: ";
			cin >> a[x].author;

			if(a[x].author == "NONE")
				break; //Breaks the loop if the author has no further books
			else
		
			for(int y = 0; y < size; y++)
				{
					cout << "Enter title " << y+1 << ": ";
					cin >> a[x].books[y].title;
					if(a[x].books[y].title == "NONE")
						break;
					else
					cout << "Enter price " << y+1 << ": "; 
					cin >>a[x].books[y].price;
			}
	}
}

[Peter87]

You have not declared catalogue anywhere.

[ajh32]

You are using a variable named 'catalogue' which hasn't been declared. The error message was kindof a hint!!

[3UMLy60M]

I have to declare it along with index right? And what would I have to initialize it to?

[Wrath89]

As far as I can tell it turns into an array of Author structs, so I'd probably initialise it as a string and set the value to something inane as a test to see if it causes problems.

string catalogue = "Test";

Usually I find the initialisation value doesn't matter that much as it just becomes the name of the array it creates after you pass it to the function.

[coder777]

int main()
{
	int index = 3; // if this should be the size of the array make it const
	Author catalogue[100]; // No need for initialization since the constructor of Author does it already

	cout << "Here is the data after initialization:\n";
	showInfo(catalogue,index); //Displays the data in the author structure called catalogue

...

	system("pause");
	return 0;
}