View Compilation Error

25943_0_3736.cpp: In function `int main()':
25943_0_3736.cpp:5: error: `x' undeclared (first use this function)
25943_0_3736.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
25943_0_3736.cpp:5: error: `y' undeclared (first use this function)