View Compilation Error

0_0_17424914_30584.cpp: In function 'int main()':
0_0_17424914_30584.cpp:47:99: error: cannot convert 'const char*' to 'long double' for argument '1' to 'int cmp(long double, long double)'
    cout<<"Case #"<<i+1<<": "<<cmp((av1y*((long double)bx-cx),av1x*((long double)by-cy))?"Yes":"No")<<endl;
                                                                                                   ^