/in/foo.cc: In function 'int main()':
/in/foo.cc:22:25: warning: unknown conversion type character 0xa in format [-Wformat=]
  printf("%.2lf%\n",a*100);
                         ^
/in/foo.cc:24:25: warning: unknown conversion type character 0xa in format [-Wformat=]
  printf("%.2lf%\n",b*100);
                         ^
/in/foo.cc:26:25: warning: unknown conversion type character 0xa in format [-Wformat=]
  printf("%.2lf%\n",c*100);
                         ^
/in/foo.cc:28:25: warning: unknown conversion type character 0xa in format [-Wformat=]
  printf("%.2lf%\n",d*100);
                         ^