diff --git a/doc/exp01-antlr.pptx b/doc/exp01-antlr.pptx
new file mode 100644
index 0000000..dd40eff
Binary files /dev/null and b/doc/exp01-antlr.pptx differ
diff --git a/src/ASTPrinter.cpp b/src/ASTPrinter.cpp
index 79abb56..47e9f92 100644
--- a/src/ASTPrinter.cpp
+++ b/src/ASTPrinter.cpp
@@ -25,4 +25,4 @@ any ASTPrinter::visitFuncRParams(SysYParser::FuncRParamsContext *ctx) {
   }
   cout << '\n';
   return nullptr;
-}
\ No newline at end of file
+}
diff --git a/src/sysyc.cpp b/src/sysyc.cpp
index b6bbc7a..3835829 100644
--- a/src/sysyc.cpp
+++ b/src/sysyc.cpp
@@ -23,6 +23,7 @@ int main(int argc, char **argv) {
   CommonTokenStream tokens(&lexer);
   SysYParser parser(&tokens);
   SysYParser::FuncRParamsContext *params = parser.funcRParams();
+  
   ASTPrinter printer;
   printer.visitFuncRParams(params);