View Compilation Error

0_0_34015599_20642.cpp: In function 'int main()':
0_0_34015599_20642.cpp:34:5: error: 'sum' was not declared in this scope
     sum++;
     ^
0_0_34015599_20642.cpp:41:5: error: 'sum' was not declared in this scope
     sum--;
     ^
0_0_34015599_20642.cpp:50:6: error: 'sum' was not declared in this scope
      sum++;
      ^
0_0_34015599_20642.cpp:57:6: error: 'sum' was not declared in this scope
      sum--;
      ^
0_0_34015599_20642.cpp:68:9: error: 'sum' was not declared in this scope
   cout<<sum*200<<endl;
         ^