I need help writing a program to output if the credit card number 5120415296389632 is valid or invalid. I have a function that inputs are the credit card number and the digit number to be stripped off. It will return the number that is in that digit. I am writing in c program language. This is what I have so far.

---------------------------------------------------------------------------

#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 main()

{

long long testNumber = 5120415296389632; //long long is a data type for a large integer

/* Comments */

getchar();

return 0;

}