Write error message to stderr.

9584e97f · Thomas Jahns · e8e8461e · 9584e97f
Commit 9584e97f authored Mar 02, 2021 by Thomas Jahns 🤸
--- a/test/test_combinatorics_c.c
+++ b/test/test_combinatorics_c.c
@@ -101,7 +101,7 @@ main()
      }
    if (failures > 0)
    {
-      printf("Number of repetitions: %"PRIu32", Failures: %zu/%zu\n",
+      fprintf(stderr, "Number of repetitions: %"PRIu32", Failures: %zu/%zu\n",
             numRuns, failures, n * n);
      for (size_t j = 0; j < n; ++j)
      {