/* thello.c: Greeting program using trigraphs */
#include <stdio.h>
main(int argc, char *argv??(??))
??<
if (argc > 1 && argv??(0??) != NULL)
printf("Hello, %s!??/n",argv??(1??));
else
printf("Hello, world!??/n");
return 0;
??>
/* End of File */