// Sum array, test-driven.
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

int sum(int a[], int n)
{
  int total = 0;
  for (int i = 0; i < n; i++) {
    total += a[i];
  }
  return total;
}

void ok(int a, int b)
{
  if (a != b) {
    fprintf(stderr, "error: TEST FAILURE: %d != %d\n", a, b);
    abort();
  }
}

void test_sum()
{
  int ints[] = {3, 53, 33};
  ok(sum(ints, 3), 3 + 53 + 33);
}

int main()
{
  test_sum();
}