View Compilation Error

0_0_17555690_11373.cpp: In function 'int main()':
0_0_17555690_11373.cpp:5:3: error: 'x1' was not declared in this scope
   x1,y1,x2,y2;
   ^
0_0_17555690_11373.cpp:5:6: error: 'y1' was not declared in this scope
   x1,y1,x2,y2;
      ^
0_0_17555690_11373.cpp:5:9: error: 'x2' was not declared in this scope
   x1,y1,x2,y2;
         ^
0_0_17555690_11373.cpp:5:12: error: 'y2' was not declared in this scope
   x1,y1,x2,y2;
            ^