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#include <stdio.h> int isValidCC(unsigned long long int CCNumber); int main() { unsigned long long int CCNumbers[]...

#include <stdio.h>

int isValidCC(unsigned long long int CCNumber);

int main()

{

unsigned long long int CCNumbers[] = {

4388576018410707ULL, // valid

4388576018402626ULL, // invalid

7388576018402686ULL, // invalid

438857601810707ULL, // invalid

4012888888881881ULL // valid

};

for (int i = 0; i < sizeof(CCNumbers) / sizeof(CCNumbers[0]); i++)

{

if (isValidCC(CCNumbers[i]))

{

printf("%llu is a valid Visa number.\n", CCNumbers[i]);

}

else

{

printf("%llu is not a valid Visa number.\n", CCNumbers[i]);

}

}

}

int isValidCC(unsigned long long int CCNumber)

{

// TO DO

}

Use one of the files above as a starting point. Only implement the isValidCC function. You do not need to change any other code. Other credit card numbers will be used to verify the function works correctly.

For this project, you will implement a function that validates Visa credit card numbers. The function will take an unsigned long long int and return an int (or bool). A file is provided for you to complete. You only need to implement the function. You must match the function prototype given. You will receive a 0 if your function implementation does not match the given prototype. Do not add any global variables.

A valid Visa credit card has the following properties:

  • starts with a 4
  • is 16 digits long
  • the Luhn algorithm results in a value that is a multiple of 10 (value % 10 = 0)
engineering   Computer-Science   
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Homework Answers

Answer #1

// C program to validate visa card numbers

#include <stdio.h>

#include <stdlib.h>

// function declaration

int isValidCC(unsigned long long int CCNumber);

int main(void) {

               unsigned long long int CCNumbers[] = {

               4388576018410707ULL, // valid

               4388576018402626ULL, // invalid

               7388576018402686ULL, // invalid

               438857601810707ULL, // invalid

               4012888888881881ULL // valid

               };

               for (int i = 0; i < sizeof(CCNumbers) / sizeof(CCNumbers[0]); i++)

               {

               if (isValidCC(CCNumbers[i]))

               {

               printf("%llu is a valid Visa number.\n", CCNumbers[i]);

               }

               else

               {

               printf("%llu is not a valid Visa number.\n", CCNumbers[i]);

               }

               }

               return EXIT_SUCCESS;

}

// function to validate that the input CCNumber is a valid Visa Card number or not

int isValidCC(unsigned long long int CCNumber)

{

               int sum=0, digit;

               int count = 0;

               unsigned long long int CCNumCopy = CCNumber;

               // loop that analyzes all the digits of the card number

               while(CCNumCopy > 0)

               {

                              digit = CCNumCopy%10; // get the last digit

                              CCNumCopy = CCNumCopy/10; // get the number removing the last digit

                              if(count % 2 == 1) // check if odd digit, then double the digit

                              {              digit = 2*digit;

                                             if(digit > 9) // if the digit after doubling is greater than 9, subtract 9 from it to get the single digit

                                                            digit = digit - 9;

                              }

                              sum += digit; // add the digit to the sum

                              count++; //count the number of digits read thus far

               }

               // if first digit is 4 , number of digits is 16 and sum is a divisible by 10, then valid else invalid

               if((digit/2 == 4) && (count == 16) && (sum%10 == 0))

                              return 1;

               else

                              return 0;

}

//end of program

Output:

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