View Compilation Error

0_0_4439468_25265.cpp: In function `int main()':
0_0_4439468_25265.cpp:71: error: `x' undeclared (first use this function)
0_0_4439468_25265.cpp:71: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4439468_25265.cpp:71: error: `y' undeclared (first use this function)