/in/foo.c: In function 'main':
/in/foo.c:10:3: error: expected ';' before 'printf'
   printf("%.3f",y);
   ^~~~~~
/in/foo.c:13:3: error: expected ';' before 'printf'
   printf("%.3f",y);
   ^~~~~~
/in/foo.c:16:3: error: expected ';' before 'printf'
   printf("%.3f",y);
   ^~~~~~
/in/foo.c:19:3: error: expected ';' before 'printf'
   printf("%.3f",y);
   ^~~~~~
/in/foo.c:6:14: warning: variable 'y' set but not used [-Wunused-but-set-variable]
     double x,y;
              ^