/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | x = float(input())
      | ^
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'x' [-Wimplicit-int]
/in/foo.c:1:5: error: expected expression before 'float'
    1 | x = float(input())
      |     ^~~~~
/in/foo.c:10:7: warning: multi-character character constant [-Wmultichar]
   10 | print('%.3f' % y)
      |       ^~~~~~