/in/foo.c:1:1: warning: data definition has no type or storage class
 weight=float(input())
 ^~~~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'weight' [-Wimplicit-int]
/in/foo.c:1:8: error: expected expression before 'float'
 weight=float(input())
        ^~~~~