View Compilation Error

0_0_25490007_6165.cpp: In function 'int xmulti(const Point&, const Point&, const Point&)':
0_0_25490007_6165.cpp:15:37: error: 'x2' was not declared in this scope
     return (p1.x-p0.x)*(p2.y-p0.y)-(x2=p2.x-p0.x)*(p1.y-p0.y);
                                     ^