diff --git a/c_expert/chapter6/print_a.c b/c_expert/chapter6/print_a.c
new file mode 100644
index 0000000..b7a843f
--- /dev/null
+++ b/c_expert/chapter6/print_a.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+
+void a(int i)
+{
+	if (i > 0)
+		a(--i);
+	else
+		printf("i has reached zero \n");
+	return;
+
+}
+
+int main(){
+	a(1);
+	return 0;
+}