diff --git a/fillit b/fillit
new file mode 100755
index 0000000..bd83e46
Binary files /dev/null and b/fillit differ
diff --git a/test_mask.c b/test_mask.c
new file mode 100644
index 0000000..ef8547d
--- /dev/null
+++ b/test_mask.c
@@ -0,0 +1,17 @@
+#include "libft.h"
+
+int		main(int ac, char **av)
+{
+	int	init;
+	int	mask;
+
+	mask = (1 << 4);
+	if (ac == 4)
+	{
+		ft_putendl(ft_convertbase(av[1], av[2], av[3]));
+		ft_putnbrendl(init);
+		init |= mask;
+		ft_putnbrendl(init);
+	}
+	return (0);
+}