Answered: I want you to correct something or add…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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instructions

program Credit Card Validator - Takes in a credit card number from a common credit card vendor (Visa, MasterCard, American Express, Discover) and validates it to make sure that it is a valid number (look into how credit cards use a checksum)

//what I need

As you can see from the instruction, I have incomplete code and I want you to correct something or add something in the code to get the output that is required in the instructions. And just to remind you the code is incomplete. here is my code.

#include <iostream>

#include<string>

#include<fstream>

using namespace std;

void printCN(string cardCN,int size);

int main()

{

string cardInput = "";

constint size = 16; // Number of digits the card number have

int card[size]; //This array stores card number

int sum = 0;

int oddSum = 0, evenSum;

cout << "Enter Credit Card Number: ";

cin >> cardInput;

for (int counter = 0; counter < cardInput.size(); counter++) card[counter] = cardInput[counter]- '0';

//Luhn Alogrithm

for (int counter = size - 1; counter >=0; counter--)

{

int placeholder;

int x = card[counter];

if (counter % 2 ==0)

{

placeholder = x * 2;

if (placeholder > 9) placeholder = placeholder - 9;

evenSum += placeholder;

}

else

{

placeholder = x;

oddSum += placeholder;

}

sum = evenSum + oddSum;

cout << "Even sum is : " << evenSum;

cout << " \n Odd sum is : " << oddSum;

cout << "\n Total sum is : " << sum << "\n\n";

if (sum % 10 == 0) {

cout << "Your";

printCN(cardInput, size);

cout << "card is valid";

}

else {

cout << "Your";

printCN(cardInput, size);

cout << "card is invalid";

}

//4000000000002829

//4000001234567899

return EXIT_SUCCESS;

}

void printCN(string cardInput, int size)

{

if (cardInput[0]=='4')

{

cout << " Visa ";

}

elseif (cardInput[0] == '6')

{

cout << " Master ";

}

else

{

cout << " Unknown Brand ";

}

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