How do I pass a variable into an array and return the variable in my function?

Question

In Python, one can easily add variables to a list and return variable in their functions. I have an assignment to write a code that validates Credit card. In C/C++, this is extremely difficult and confusing due to data type of variables and return type of functions.
I'm trying to write a function that will input the digits in a "long long" variable into an array "integer" variable and then return the array.
https://code.sololearn.com/cDEnSx6u0cc3/?ref=app

Answer 1

I've edited your code and it works. But it has become so complicated and I think you should consider the card number as a string or character array. It'd make the problem simpler.

https://code.sololearn.com/cx0pzTHo2BkK/?ref=app

Answer 2

To pass the reference/address of array, so that it can be changed inside that function.

Returning array from a function seems critical to me. That's why I used void function. But void function can't modify any variable if we don't pass the reference / memory address of it.

Use char array instead, as follows. Using long long will cause more problems later.

char card[ ] = "123456789555555465";
for(int i=0; i<strlen(card); i++){
cout<<card[i]<<endl;
}

Answer 3

@Shamima What's the reason for using pointers in the ccDigits function?