/in/foo.cc:28:26: error: stray '\357' in program
  printf("%c=%.3lf",a,ans)；
                          ^
/in/foo.cc:28:27: error: stray '\274' in program
  printf("%c=%.3lf",a,ans)；
                           ^
/in/foo.cc:28:28: error: stray '\233' in program
  printf("%c=%.3lf",a,ans)；
                            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:29:2: error: expected ';' before 'return'
  return 0;
  ^~~~~~