Return an array in c++

Question

Suppose I have an array

int arr[] = {...};
arr = function(arr);

I have the function as

 int& function(int arr[])
 {
//         


        

Answer 1

• An array as argument is actually a pointer. Arrays are automatically 'casted' to pointers if given as argument
• You can't assign an array to another array in C/C++. You will have to use a memcpy or loop to copy the values.
• If function changes the arr argument, it actually changes the value of the arr variable given by the caller. Again because the array is actually a pointer. So in the caller arr is assigned to arr, which is useless here.