View Compilation Error

25931_0_14554.cpp: In function `int main()':
25931_0_14554.cpp:5: error: `x' undeclared (first use this function)
25931_0_14554.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
25931_0_14554.cpp:5: error: `y' undeclared (first use this function)