#include

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. ", CCNumbers[i]);

}

else

{

printf("%llu is not a valid Visa number. ", 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)