sprintf fix on C++ tutorial server

Reviewed By: danli

Test Plan: hello


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665097 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tutorial/cpp/CppServer.cpp b/tutorial/cpp/CppServer.cpp
index 4b7fcaf..3be19c0 100644
--- a/tutorial/cpp/CppServer.cpp
+++ b/tutorial/cpp/CppServer.cpp
@@ -69,7 +69,9 @@
 
     SharedStruct ss;
     ss.key = logid;
-    ss.value = "5";
+    char buffer[11];
+    sprintf(buffer, "%d", val);
+    ss.value = buffer;
 
     log[logid] = ss;