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clrscr() is in conio.h..

example:

#include <stdio.h>
#include <conio.h> /*library that contain clrscr() */

void main() {
printf("\nHello World. Press enter to clear this screen.");...

Thanks again.
Sorry for making things complicated. But i'm glad that you still understand what I'm trying to say.

frankly speaking, i am not quite fluent in term of written english.

Thanks a lot....why I didn't think about it before...

Now i remember that we use that formula in math for te same reason....

thanks for reminding me...but if problems occur, I'll ask again...
...

Does anyone can help me.??

Does anyone know how to build a programme that can receive binary number and convert it to decimal number.

Thank You, hope there's anyone can solve my problem..