View Compilation Error

0_0_15139093_4734.cpp: In function 'int main()':
0_0_15139093_4734.cpp:73:16: error: 'x' was not declared in this scope
      int tmp = x;
                ^
0_0_15139093_4734.cpp:74:10: error: 'y' was not declared in this scope
      x = y;
          ^