/in/foo.c:1:1: warning: data definition has no type or storage class
    1 | weight = float(input("请输入你的体重(千克):"))
      | ^~~~~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'weight' [-Wimplicit-int]
/in/foo.c:1:10: error: expected expression before 'float'
    1 | weight = float(input("请输入你的体重(千克):"))
      |          ^~~~~