View Compilation Error

0_0_27667967_18321.cpp: In function 'int main()':
0_0_27667967_18321.cpp:19:6: error: 'x' was not declared in this scope
   if(x*x-4*y>=0 && (int)sqrt(x*x-4*y) == sqrt(x*x-4*y))
      ^
0_0_27667967_18321.cpp:19:12: error: 'y' was not declared in this scope
   if(x*x-4*y>=0 && (int)sqrt(x*x-4*y) == sqrt(x*x-4*y))
            ^