Fix missing header

liurui39660 · liurui39660 · commit ad175770b0bc · 2020-11-17T19:18:32.000+08:00
diff --git a/example/Demo.cpp b/example/Demo.cpp
@@ -14,6 +14,7 @@
 // limitations under the License.
 // -----------------------------------------------------------------------------
 
+#include <cstdio>
 #include <chrono>
 
 #include "NormalCore.hpp"
