How to terminate the program from class?

[Iamcrysis]

Hello everyone !
I'm trying to terminate a program from inside a function in my class. Look Below:

#include<iostream>
#include<string>
#include<vector>
#include<cstdlib>
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);
}
//USER MESSAGE
void Message() {
int i;
vector<int>::size_type sz = products.size();
           cout<<"\nJu keni "<<sz<<" fatura te ruajtura ne sistem:\n";
           for ( i=0; i < sz; i++ ) {
               cout<<"\n"<<i+1<<". "<< products[i];
               }
               if (i = sz) cout<<endl;
               cout<<"\nCilen fature doni te aksesoni? "; cin>>NumInvoice;
               while (NumInvoice < sz || NumInvoice > sz) {
                              cout<<"\nKeni dhene numer te gabuar. Jepni nje te sakte: ";
                              cin>>NumInvoice;}
               cout<<endl;
               FInvoice(NumInvoice);
}
//INVOICE COMPILER
int FInvoice(int m) {
int t = m - 1;
int n;
double Total = prices[t] * quantities[t];
     cout<<"Produkti: "<< products[t]<<endl;
     cout<<"\t  "<< descriptions[t]<<"\n\t  "<< prices[t]<<"\n\t  "<< quantities[t]<<"\n";
     cout<<"Totali:   "<<Total<<endl;
     cout<<"\nDoni te aksesoni ndonje fature tjeter? (JO = 0) "; cin>>n;
     if (n = 0) { 
                } //WHAT'S HERE ?????????????????????????????????????????????????????????????????????????????????
     else Message();
     }
//CLASS VARIABLES
private:
string Number, Description;
double Price;
int Quantity, NumInvoice;
//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;
cout<<"Programi ka si funksion ruajtjen e faturave te mallrave ne sistem dhe lejon     perdoruesin te aksesoje te gjithe mallrat pasi jane ruajtur.";
//CONTINUOUS LOOPING TO SAVE ALL INVOICES  
do {
cout<<"\n\nNumri i Produktit: ";  cin >> Number_;
myInvoice.setNumber(Number_);
cout<<"\nPershkrimi i Produktit: ";     getline(cin, Description_);
while (Description_ == "") {              getline(cin, Description_);}
myInvoice.setDescription(Description_);
cout<<"\nCmimi i Produktit: ";           cin >> Price_;
myInvoice.setPrice(Price_);
cout<<"\nSasia e Produktit: ";        cin >> Quantity_;
myInvoice.setQuantity(Quantity_);
cout<<"\nProdukti u ruajt me sukses ne sistem."<<endl;
cout<<"\nDoni te ruani me shume fatura? (JO = 0) "; cin >> n;
} while(n!=0);
myInvoice.Message();
return 0;
}

Please help.

[Iamcrysis]

LINE 54 !!
Whatever you insert in cin>>n inside function FInvoice() program sends you to function Message() again.
I want to terminate the program if n is 0.

[mik2718]

If you just want to bomb out use exit() which is in cstdlib

exit(EXIT_SUCCESS) if the program has terminated OK.

exit(EXIT_FAILURE) if the program has failed.

or you could throw an exception that is not caught, maybe

[Iamcrysis]

I tried it but still the function sends me to Message() ...any way to implement this ?

[Mathhead200]

if( n == 0 )

You are assigning 0 to n, which returns 0 AKA "false" therefor the else clause always runs.

[Iamcrysis]

Thanks, that's right :)