I need help debugging my program. It is a program using Luhn's algorithm to validate a 16 digit credit card. The program assumes the card number is 16 digits long. The output is supposed to either state invalid or valid.However, when I put it in a valid credit card number, it still outputs it as invalid.

For Reference:

To validate a credit card number, you perform the following steps:

Loop through the number one digit at a time.

The digits in the odd-numbered digits are accumulated.

The digits in the even-numbered digits are split into tens and one, these are added together, and then all of them are accumulated.

When done looping, add the accumulated odd and even accumulations together. If the result is evenly divisible by ten, the number is valid.

Here is my code:

#include

#include

#include

int stripper(long long longNumber, int digitNumber) {

return ((longNumber - ((long long)(longNumber / pow(10, digitNumber))*pow(10, digitNumber))) / pow(10, digitNumber - 1));

}

int isOdd(long int digit)

{

if (digit % 2 == 0)

return 0;

else

return 1;

}

int splitTens(int num) {

return ((num / 10) % 10);

}

int splitOnes(int num) {

return (num % 10);

}

int main() {

long long testNumber, sum = 0;

int i, currDig;

printf("Please enter credit card number ");

scanf_s("%lld", &testNumber);

for (i = 1; i

if (isOdd(i) == 0) {

// even location digit

sum += stripper(testNumber, i);

}

else {

// odd location digit, double the number and add digits of of the number after doubling

currDig = stripper(testNumber, i);

currDig *= 2;

sum += splitOnes(currDig) + splitTens(currDig);

}

}

if (sum % 10 == 0)

printf("Valid Credit Card Number");

else

printf("Invalid Credit Card Number");

getchar();

getchar();

return 0;

}

Here is what I am getting entering a valid credit card number

CAUsersewe Docurrments\CreditCard1DebugCreditCard1.exe Please enter credit card number 5126415296389632 Invalid Credit Card Numbe Menut O Type here to search 12:02 PM R3/21/2018