/in/foo.c: In function 'main':
/in/foo.c:6:2: warning: implicit declaration of function 'scnaf' [-Wimplicit-function-declaration]
  scnaf("%d%d%d",&x,&y.&z);
  ^~~~~
/in/foo.c:6:23: error: expected identifier before '&' token
  scnaf("%d%d%d",&x,&y.&z);
                       ^