Frustrated by a problem I don't see !

[Iamcrysis]

Hello everyone !
I'm having a weird problem after execution.
Here's my code :

#include<iostream>
#include<string>
#include<vector>
using namespace std;
class Invoice {
public:
//SET METHOD FOR PRODUCT NUMBER 
void setNumber(string number) {
Number = number;
products.push_back (Number);
}
//SET METHOD FOR DESCRIPTION
void setDescription(string description) {
Description = description;
descriptions.push_back (Description);
}
//SET METHOD FOR PRICE 
void setPrice(double price) {
Price = price;
prices.push_back (Price);
}
//SET METHOD FOR QUANTITY 
void setQuantity(int quantity) {
Quantity = quantity;
quantities.push_back (Quantity);
}
//INVOICE COMPILER
void getInvoice() {
double Total = Quantity*Price;
           cout<<"\n\n------------------ Invoice ------------------\n\n\n";
           cout<<"Products : "<<(int) products.size()<< endl;
           cout<<"Descriptions : "<<(int) descriptions.size()<< endl;
           cout<<"Prices : "<<(int) prices.size()<< endl;
           cout<<"Quantities : "<<(int) quantities.size()<< endl;
}
//CLASS VARIABLES
private:
string Number, Description;
double Price;
int Quantity;
//VECTORS FOR SAVING INFORMATION    
vector<string> products;
vector<string> descriptions;
vector<double> prices;
vector<int> quantities;
};
//MAIN FUNCTION
int main() {
string Number_, Description_;
double Price_;
int Quantity_ ,n;
Invoice myInvoice;
do {
cout<<"\nWhat's the product number? ";  getline(cin, Number_);
myInvoice.setNumber(Number_);
cout<<"\nWhat's the description? ";     getline(cin, Description_);
myInvoice.setDescription(Description_);
cout<<"\nWhat's the price? ";           cin >> Price_;
myInvoice.setPrice(Price_);
cout<<"\nWhat's the quantity? ";        cin >> Quantity_;
myInvoice.setQuantity(Quantity_);
cout<<"\nWant to save more invoices in the system? (NO=0) :"; cin >> n;
} while(n!=0);
myInvoice.getInvoice();
system("pause");
return 0;
}

The output I get is this : http://i40.tinypic.com/qrn6tk.png
I don't understand why program doesn't take in consideration anymore this line :

getline(cin, Number_);

This is just a test program.

[tfityo]

cin >> n; does not discard new line character, getline() tries to read the line and read empty line.

You can update the code in such a way:

do{
 getline(cin, Number_);
}while(Number_ == "");

[Iamcrysis]

Thanks a lot !

[bluecoder]

int main() {
string Number_, Description_;
double Price_;
int Quantity_ ,n;
Invoice myInvoice;
do {
		cout<<"\nWhat's the product number? ";  getline(cin, Number_);
		myInvoice.setNumber(Number_);
		cin.ignore( numeric_limits <streamsize> ::max(), '\n' );  // get rid of that pesky Enter key

		cout<<"\nWhat's the description? ";     getline(cin, Description_);
		myInvoice.setDescription(Description_);
		cin.ignore( numeric_limits <streamsize> ::max(), '\n' );  // get rid of that pesky Enter key

		cout<<"\nWhat's the price? ";           cin >> Price_;
	

		myInvoice.setPrice(Price_);
		cout<<"\nWhat's the quantity? ";        cin >> Quantity_;
	

		myInvoice.setQuantity(Quantity_);
		cout<<"\nWant to save more invoices in the system? (NO=0) :"; cin >> n;
} while(n!=0);