After you download the program, run it and there is an empty note.



We must use #include for the start.
It called library, it contain many function.
And there are many library, such as #include <stdio.h> #include <stdlib.h> etc

For the begin, let's start with #include <stdio.h>
It contain many function too
Like : printf, scanf, etc.
We will learn further later.

And with void main()
It called function too.
So the empty note should be like this if you want to start the code.

#include <stdio.h>





void main()


{


     


}
okey, that all the introduction, let's start to code in system I/O




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