//Written by Mo Kashi

//This program accepts a  credit card number and
//specifies wether that card is valid or not.
//The card is valid if the product of its digits
//is divisible by the sum of the its digits.


#include<iostream>
#include<fstream>
ofstream fout;
int freeze;
class Credit{
public:
  int readCardNumber();
  void displayIfCardValid(int);
  void Banner();
};//class Credit


void Credit::Banner(){//This method prints out my banner
cout<<endl;
cout<<"Name:Mo Kashi"<<endl;

cout<<endl;

fout<<endl;
fout<<"Name:Mo Kashi"<<endl;
fout<<endl;
}//Method Banner


int Credit::readCardNumber(){//This method
//prompts user to enter a credid card number containing
//9 digits.If it is not 9 digit number it gives an appropriate
//message asking fo a 9 digit number.

int number;
cout<<"Please enter a 9 digit card number(999999999 to quit):\n";
cin>>number;
fout<<"Please enter a 9 digit card number(999999999 to quit):\n";
fout<<number<<endl;

while(number>=1000000000||number<=99999999){
   cout<<"Card number not 9 digits..try again:"<<endl;
   cout<<"Please enter a 9 digit card number (999999999 to quit):"<<endl;
   cin>>number;

   fout<<"Card number not 9 digits..try again:"<<endl;
   fout<<"Please enter a 9 digit card number (999999999 to quit):"<<endl;
   fout<<number<<endl;
}//while

return number;

}//method readCardNumber


void Credit::displayIfCardValid(int Number){//This method gets a credit card number
//and specifies wether it is valid or not.It prints out
//an appropriate message in any case.

int digit;
int product_of_digits=1;
int sum_of_digits=0;

while(Number>10){
   digit=Number%10;
   sum_of_digits=sum_of_digits+digit;
   product_of_digits=product_of_digits*digit;
   Number=(Number-digit)/10;
 }//while

sum_of_digits=sum_of_digits+Number;
product_of_digits=product_of_digits*Number;

if(product_of_digits%sum_of_digits==0){
  cout<<"..Valid"<<endl;
  fout<<"..Valid"<<endl;
}//if
else{
  cout<<"..Not valid"<<endl;
  fout<<"..not valid"<<endl;
}//else
}//displayIfCardValid


void main(){
int cardNumber;
Credit creditObj;
fout.open("c:\\output.txt");
creditObj.Banner();
cardNumber=creditObj.readCardNumber();

while(cardNumber!=999999999){
   creditObj.displayIfCardValid(cardNumber);
   cardNumber=creditObj.readCardNumber();
}//while

cout<<"Enter an integer to exit:"<<endl;
cin>>freeze;
}//main()