View Compilation Error

0_0_39049422_7430.cpp: In function 'int main()':
0_0_39049422_7430.cpp:10:13: error: 'sum' was not declared in this scope
   10 |             sum+=i;
      |             ^~~
0_0_39049422_7430.cpp:12:15: error: 'sum' was not declared in this scope
   12 |         cout<<sum<<endl<<endl;
      |               ^~~