Merge pull request #4 from Z-Y00/master

Adding stdio to examples.

Author: claudebarthels

src/examples/read-write-send.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <cassert>
 

src/examples/send-performance.cpp

@@ -7,6 +7,7 @@
  */
 
 #include <stdlib.h>
+#include <stdio.h>
 #include <unistd.h>
 #include <math.h>
 #include <time.h>