diff --git a/README.md b/README.md
index d19331b..4112965 100644
--- a/README.md
+++ b/README.md
@@ -34,13 +34,13 @@ Better choose the latest update of the interpreter.
 
 MUST USE -O2/-O3 if want to optimize the interpreter!
 
-Also remember to use g++ and clang++.
+Also remember to use g++ or clang++.
 
-> g++ | clang++ -std=c++11 -O2 main.cpp -o nasal.exe
+> [cpp compiler] -std=c++11 -O2 main.cpp -o nasal.exe
 
 Or use this in linux/macOS/Unix
 
-> g++ | clang++ -std=c++11 -O2 main.cpp -o nasal
+> [cpp compiler] -std=c++11 -O2 main.cpp -o nasal
 
 ## How to Use?
 
@@ -71,7 +71,11 @@ The interpreter's interactive mode will do this automatically,so you don't need
 LL(k) parser.
 
 ```javascript
-(var a,b,c)=[{b:nil},[1,2],func{return 0;}];
+(var a,b,c)=[
+    {b:nil},
+    [1,2],
+    func{return 0;}
+];
 (a.b,b[0],c)=(1,2,3);
 ```
 
@@ -485,7 +489,13 @@ var b="another string";
 var b=`c`;
 
 var c=[];
-var c=[0,nil,{},[],func(){return 0;}];
+var c=[
+    0,
+    nil,
+    {},
+    [],
+    func(){return 0;}
+];
 append(c,0,1,2);
 
 var d={
@@ -690,6 +700,7 @@ nasal_val* builtin_print(std::vector<nasal_val*>& local_scope,nasal_gc& gc)
             case vm_hash: i->ptr.hash->print();        break;
             case vm_func: std::cout<<"func(...){...}"; break;
         }
+    std::cout<<std::flush;
     // if a nasal value is not in use,use gc::del_reference to delete it
     // generate return value,use gc::gc_alloc(type) to make a new value
     // or use reserved reference gc.nil_addr/gc.one_addr/gc.zero_addr
diff --git a/nasal_builtin.h b/nasal_builtin.h
index 56210c7..e65c2c6 100644
--- a/nasal_builtin.h
+++ b/nasal_builtin.h
@@ -124,6 +124,7 @@ nasal_val* builtin_print(std::vector<nasal_val*>& local_scope,nasal_gc& gc)
             case vm_hash: i->ptr.hash->print();        break;
             case vm_func: std::cout<<"func(...){...}"; break;
         }
+    std::cout<<std::flush;
     // generate return value
     return gc.nil_addr;
 }
diff --git a/nasal_parse.h b/nasal_parse.h
index 89acb7a..6f0f3d7 100644
--- a/nasal_parse.h
+++ b/nasal_parse.h
@@ -68,7 +68,7 @@ private:
     nasal_ast func_gen();
     nasal_ast args_gen();
     nasal_ast expr();
-    nasal_ast exprs_gen();
+    nasal_ast exprs();
     nasal_ast calc();
     nasal_ast or_expr();
     nasal_ast and_expr();
@@ -362,7 +362,7 @@ nasal_ast nasal_parse::func_gen()
         node.add_child(args_gen());
     else
         node.add_child(null_node_gen());
-    node.add_child(exprs_gen());
+    node.add_child(exprs());
     return node;
 }
 nasal_ast nasal_parse::args_gen()
@@ -476,7 +476,7 @@ nasal_ast nasal_parse::expr()
     }
     return node;
 }
-nasal_ast nasal_parse::exprs_gen()
+nasal_ast nasal_parse::exprs()
 {
     if(tok_list[ptr].type==tok_eof)
     {
@@ -875,7 +875,7 @@ nasal_ast nasal_parse::while_loop()
     match(tok_lcurve);
     node.add_child(calc());
     match(tok_rcurve);
-    node.add_child(exprs_gen());
+    node.add_child(exprs());
     return node;
 }
 nasal_ast nasal_parse::for_loop()
@@ -921,7 +921,7 @@ nasal_ast nasal_parse::for_loop()
     else
         node.add_child(calc());
     match(tok_rcurve);
-    node.add_child(exprs_gen());
+    node.add_child(exprs());
     return node;
 }
 nasal_ast nasal_parse::forei_loop()
@@ -945,7 +945,7 @@ nasal_ast nasal_parse::forei_loop()
         die(error_line,"expected vector");
     node.add_child(calc());
     match(tok_rcurve);
-    node.add_child(exprs_gen());
+    node.add_child(exprs());
     return node;
 }
 nasal_ast nasal_parse::new_iter_gen()
@@ -976,7 +976,7 @@ nasal_ast nasal_parse::conditional()
     match(tok_lcurve);
     tmp.add_child(calc());
     match(tok_rcurve);
-    tmp.add_child(exprs_gen());
+    tmp.add_child(exprs());
     node.add_child(std::move(tmp));
     // end of if-expression
     while(tok_list[ptr].type==tok_elsif)
@@ -986,14 +986,14 @@ nasal_ast nasal_parse::conditional()
         match(tok_lcurve);
         tmp.add_child(calc());
         match(tok_rcurve);
-        tmp.add_child(exprs_gen());
+        tmp.add_child(exprs());
         node.add_child(std::move(tmp));
     }
     if(tok_list[ptr].type==tok_else)
     {
         nasal_ast tmp(tok_list[ptr].line,ast_else);
         match(tok_else);
-        tmp.add_child(exprs_gen());
+        tmp.add_child(exprs());
         node.add_child(std::move(tmp));
     }
     return node;