Not sure how to do this loop with a read in file to validate a credit card

[lynn1991]

#include <iostream>
#include <iomanip>
#include <string>
#include <fstream>

using namespace std;
int main()

{
int count;
int creditcard_number, digit, digit2, sum;
int credit1,credit2,credit3,credit4,credit5,credit6;
count = 0;

ifstream myfile;
myfile.open ("CreditCards.txt");
if(!myfile.fail())
{
__int64 credit1, credit2, credit3, credit4, credit5, credit6;
double creditcard_number;

myfile>>credit1>>credit2>>credit3>>credit4>>credit5>>credit6;
cout << credit1<<credit2<<credit3<<endl;
}
else
{
cout<< "Couldn't read file"<<endl;
}

while (myfile>>credit1>>credit2>>credit3>>credit4>>credit5>>credit6)
{

count++;
digit = creditcard_number % 10;

if (digit % 2== 0 )
{
digit2 = digit *2;

if (digit2 >9)
{
sum += 1+ digit2 %10;
}
else
{
sum+= digit2;
}

else
{
sum += digit;
creditcard_number /=10;
}
}
myfile.close();

return 0;

[sherre02]

You'll still have to troubleshoot this. I cleaned up your code, got rid of what it looked like wasn't necessary, etc.

Does your compiler support '__int64' or 'long long' declarations? Or do you actually need to do some bit-shifting magic?

Anyways, this is a start.

#include <iostream>
#include <fstream>

using namespace std;


int main(){
    int count = 0;
    float digit, digit2, sum;
    __int64 c1, c2, c3, c4, c5, c6;
    double ccNum;

    ifstream myfile;
    myfile.open ("CreditCards.txt");

    if(myfile.fail()) return 0;

    myfile>> c1 >> c2 >> c3 >> c4 >> c5 >> c6;
    cout << c1 << c2 << c3 << c4 << c5 << c6 << endl;

    while (myfile >> c1 >> c2 >> c3 >> c4 >> c5 >> c6) { 
        count++;
        digit = ccNum % 10;

        if (digit % 2 == 0){
            digit2 = digit * 2;

            if (digit2 > 9) sum += (1 + digit2) % 10;
            else sum += digit2;
        }
        else{
            sum += digit;
            ccNum /= 10;
        }
    }

    myfile.close();

    return 0;
}

[lynn1991]

Thanks sorry for taking so long to respond I was about to figure it out :]