View Compilation Error

0_0_1590859_17866.cpp: In function `int pt()':
0_0_1590859_17866.cpp:22: error: `x' undeclared (first use this function)
0_0_1590859_17866.cpp:22: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1590859_17866.cpp:30: error: `y' undeclared (first use this function)
0_0_1590859_17866.cpp:53: error: `x2' undeclared (first use this function)