// Program Char
#include <stdio.h>

main ()
{
     char ch;
     textcolor (9);
     textbackground (1);
     clrscr ();
     printf ("Presiona un caracter: ");
     textcolor (15);
     clreol ();
     ch = getche ();
     printf (" %c", islower(ch) ? toupper(ch):tolower(ch));
     getch ();
     return 0;
}