错误：下标值既不是数组也不是指针

Question

int get_first(int arr[],int count)
{

   int half = count / 2;

   int *firstHalf = malloc(half * sizeof(int));
   memcpy(firstHalf, arr, half * sizeof(int));
   return firstHalf;
}

int get_second(int arr[], int count)
{
    int half = count / 2;

    int *secondHalf = malloc(half * sizeof(int));
    memcpy(secondHalf, arr + half , half * sizeof(int));
    return secondHalf;
}

int result = get_first(arr, count);
int size = sizeof(result) / sizeof(result[0]);

i am writing a function that split an array into two equal parts. the function takes in an array and the size of the array. I am testing the function by storing the first half of the array in the result and print its length. But when I build the function, the line

int size = sizeof(result) / sizeof(result[0]);

gives an error says "error: subscripted value is neither array nor pointer"

Is it because my function failed to pass the first half of the array into result? or the way of storing an array is wrong? If so, how do I split the array, can someone help me to fix it? thanks in advance.

Answer 1

There are two problems that I can see:

1. In functions int get_first(int arr[],int count) and int get_second(int arr[], int count) you are returning int pointers but functions' return type are int.
2. result is declared as int but you are accessing it like result[0].

Correction for 1 is obvious from point 1 above. Correction for 2:

Instead of:

int result = get_first(arr, count);

You should write:

int *result = get_first(arr, count);

Hope this helps.