scrat@scrat:~$ gcc -o omg omg.c
omg.c:5:56: warning: trigraph ??/ ignored, use -trigraphs to enable
scrat@scrat:~$ ./omg
hi
hi
hi
hi
hi
hi
hi
hi
hi
hi
scrat@scrat:~$ gcc -trigraphs -o omg omg.c
scrat@scrat:~$ ./omg
hi