/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: character constant too long for its type
   10 | print('{:.3f}'.format(y))
      |       ^~~~~~~~