diff --git a/data_types.c b/data_types.c
--- a/data_types.c
+++ b/data_types.c
@@ -57,5 +57,5 @@
     printf ("\n%20s %4d \t\t %#1.2g \t\t %#1.2g\n", "float", 8 * sizeof (float), (double)FLT_MIN, (double)FLT_MAX);
     printf ("%20s %4d \t\t %#1.2g \t\t %#1.2g\n", "double", 8 * sizeof (double), (double)DBL_MIN, (double)DBL_MAX);
 
-    return 0;
+    return EXIT_SUCCESS;
 }