/in/foo.c:1:1: warning: data definition has no type or storage class
 len=int(input("球体半径"))
 ^~~
/in/foo.c:1:1: warning: type defaults to 'int' in declaration of 'len' [-Wimplicit-int]
/in/foo.c:1:5: error: expected expression before 'int'
 len=int(input("球体半径"))
     ^~~
/in/foo.c:4:6: error: stray '\357' in program
 print（'%.4f'%V)
      ^
/in/foo.c:4:7: error: stray '\274' in program
 print（'%.4f'%V)
       ^
/in/foo.c:4:8: error: stray '\210' in program
 print（'%.4f'%V)
        ^
/in/foo.c:4:9: warning: multi-character character constant [-Wmultichar]
 print（'%.4f'%V)
         ^~~~~~