Add #include <stdio.h> because using printf causes a compile error

[StdEnku]

Hello I get a compile error in my modified file saying

error:‘printf’ was not declared in this scope 

include

Send a pull request with the addition of.

[totalgee]

Minor note: it's better C++ practice to #include <cstdio> rather than stdio.h, to put things in the std namespace.

[StdEnku]

Thank you for teaching. I have fixed it.