View Compilation Error

0_0_18026508_30262.cpp:22:9: error: stray '\' in program
         printf("%.2lf\n",ans*1.0\n);
         ^
0_0_18026508_30262.cpp: In function 'int main()':
0_0_18026508_30262.cpp:22:34: error: expected ')' before 'n'
         printf("%.2lf\n",ans*1.0\n);
                                  ^