How to define a function with array output as well as array inputs?

Question

Just write a tiny function to help me understand. Thanks.

Answer 1

Please be a bit more specific.

Answer 2

You can't return an array. You can only return a pointer to an array. So:

int *f(int a[], int b[]);

Answer 3

Just create a function that takes an array and return another array, suppose you have to modify it or sort it
Eg.

int *sort(int *arr, int size) {
// Some code here
}
Edit : however, when using an array in a function, the data of the array one modified will be permanent.