helloworld in android

Add helloworld(native c):        
 1. # mkdir $(YOUR_ANDROID)/development/hello        
 2. # vim hello.c： 　　          
  #include
          　　int main()           　
{             
 printf("Hello World! ");              
return 0;　　            
}         
 3.# vim Android.mk            
 LOCAL_PATH:= $(call my-dir) 　　       
 include $(CLEAR_VARS) 　　        
LOCAL_SRC_FILES:= 　　       
 hello.c 　　       
 LOCAL_MODULE := helloworld 　　       
 include $(BUILD_EXECUTABLE)         
4.make helloworld