Ok, I can't seem to figure out why this is not working. Here is the snippet that I'm having trouble with.

Code:
#include <conio.h>
#include <string.h>
                
void keypress();

void main()
{

clrscr();
keypress();

}

void keypress()
{
textcolor(14);
gotoxy(35,13);
cprintf("Are you sure you want to continue?");
getch();
}
And here is the errors that my compiler is giving me.

copy.cpp(9) : error C2065: 'clrscr' : undeclared identifier

copy.cpp(16) : error C2065: 'textcolor' : undeclared identifier

copy.cpp(17) : error C2065: 'gotoxy' : undeclared identifier

Any ideas what is wrong? Even with the errors that the compiler is giving me I know that code is right. Or at least I think it is.

Any help is appreciated.

Thanks.