#include <assert.h>
#include <stdlib.h>

int main()
{
    const size_t N = 1000;

    int *p = (int *)malloc(N * sizeof(int));

    assert(p != NULL); // successful memory allocation?

    for (size_t i = 0; i < N; ++i)
        p[i] = i;

    int sum = 0;
    for (size_t i = 0; i < N; ++i)
        sum += p[i];

    // free(p); // memory leak

    return sum;
}