How can I allocate memory for array inside a function

Question

I am trying to receive a number from the user. And create an array with that number, but, inside a function. Here are my few attempts, I get into run time errors. Help is ve

Answer 1

int *pp;
p = (int *)malloc(num*sizeof(int));
if (!pp) /* pp is used uninitialized at this point */

---

int *p;
int num, i;
puts("Enter num of grades:");
scanf("%d", &num);
Init(&p, num);
free(p); /* p is used uninitialized at this point */

If you want to allocate space for a pointer to int inside another function, you need to pass a pointer to pointer:

...
Init(&p, num);
...
int Init(int **pp, int num)
{
    *pp = malloc(num * sizeof(int));
    ...