/in/foo.c: In function 'main':
/in/foo.c:5:14: error: stray '\357' in program
  printf("30")；
              ^
/in/foo.c:5:15: error: stray '\274' in program
  printf("30")；
               ^
/in/foo.c:5:16: error: stray '\233' in program
  printf("30")；
                ^
/in/foo.c:6:2: error: expected ';' before 'return'
  return 0；
  ^~~~~~
/in/foo.c:6:10: error: stray '\357' in program
  return 0；
          ^
/in/foo.c:6:11: error: stray '\274' in program
  return 0；
           ^
/in/foo.c:6:12: error: stray '\233' in program
  return 0；
            ^