View Compilation Error

0_0_38140972_27532.cpp: In function 'bool InPolygon(Point)':
0_0_38140972_27532.cpp:77:24: error: 'p' was not declared in this scope
         if(dcmp(P.x - (p.y-p1.y)*(p1.x-p2.x)/(p1.y-p2.y)-p1.x)<0)
                        ^