运行 ID: 230

Main.cc: In function ‘int main()’:
Main.cc:3:5: error: ‘printf’ was not declared in this scope
     printf("%d",9);
     ^~~~~~
Main.cc:3:5: note: ‘printf’ is defined in header ‘’; did you forget to ‘#include ’?
Main.cc:1:1:
+#include 
 int main()
Main.cc:3:5:
     printf("%d",9);
     ^~~~~~