foo.cc: In function 'int main()':
foo.cc:32:34: warning: unknown conversion type character '\x0a' in format [-Wformat=]
  printf("%.2lf%\n",sum[0]*100.0/n);
                                  ^
foo.cc:33:34: warning: unknown conversion type character '\x0a' in format [-Wformat=]
  printf("%.2lf%\n",sum[1]*100.0/n);
                                  ^
foo.cc:34:34: warning: unknown conversion type character '\x0a' in format [-Wformat=]
  printf("%.2lf%\n",sum[2]*100.0/n);
                                  ^
foo.cc:35:34: warning: unknown conversion type character '\x0a' in format [-Wformat=]
  printf("%.2lf%\n",sum[3]*100.0/n);
                                  ^

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