/in/foo.c:1:3: error: invalid preprocessing directive #�
 # 输入三个整数
   ^
/in/foo.c:2:1: warning: data definition has no type or storage class
 a = int(input())
 ^
/in/foo.c:2:1: warning: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
/in/foo.c:2:5: error: expected expression before 'int'
 a = int(input())
     ^~~
/in/foo.c:6:3: error: invalid preprocessing directive #�
 # 使用if...elif...else语句找出最大的数
   ^