View Compilation Error

0_0_28541493_26734.cpp: In function 'int main()':
0_0_28541493_26734.cpp:17:17: error: 'sum' was not declared in this scope
   for(int i=0;i<sum.;i++) cout<<arr[i];
                 ^
0_0_28541493_26734.cpp:17:21: error: expected unqualified-id before ';' token
   for(int i=0;i<sum.;i++) cout<<arr[i];
                     ^