View Compilation Error

0_0_38142721_18265.cpp:13:16: error: 'Point' was not declared in this scope
 bool OnSegment(Point P1,Point P2,Point Q)
                ^
0_0_38142721_18265.cpp:13:25: error: 'Point' was not declared in this scope
 bool OnSegment(Point P1,Point P2,Point Q)
                         ^
0_0_38142721_18265.cpp:13:34: error: 'Point' was not declared in this scope
 bool OnSegment(Point P1,Point P2,Point Q)
                                  ^
0_0_38142721_18265.cpp:13:41: error: expression list treated as compound expression in initializer [-fpermissive]
 bool OnSegment(Point P1,Point P2,Point Q)
                                         ^
0_0_38142721_18265.cpp:14:1: error: expected ',' or ';' before '{' token
 {
 ^
0_0_38142721_18265.cpp:20:16: error: 'Point' was not declared in this scope
 bool InPolygon(Point P)
                ^
0_0_38142721_18265.cpp:21:1: error: expected ',' or ';' before '{' token
 {
 ^