View Compilation Error

0_0_8452108_22085.cpp: In function `int main()':
0_0_8452108_22085.cpp:16: error: `ans' undeclared (first use this function)
0_0_8452108_22085.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8452108_22085.cpp:19: error: `x' undeclared (first use this function)
0_0_8452108_22085.cpp:19: error: `y' undeclared (first use this function)