Fix printf format specifier in simple_example.md

* doc/simple_example.md (Writing the program): Adjust printf format
specifier to match the argument type.

diff --git a/doc/simple_example.md b/doc/simple_example.md
index e19d5686335a45472ac8114b01ab2fec5edb0bc3..1fefc83b5972253c8b405e8c8ec737ebcb5449bb 100644 (file)
--- a/doc/simple_example.md
+++ b/doc/simple_example.md
@@ -99,7 +99,8 @@ The following program `loop.c` is a trivial example:
             assert(*p == 0);
             *p = (int *) GC_REALLOC(q, 2 * sizeof(int));
             if (i % 100000 == 0)
-                printf("Heap size = %d\n", GC_get_heap_size());
+                printf("Heap size = %lu bytes\n",
+                       (unsigned long)GC_get_heap_size());
         }
         return 0;
     }