View Compilation Error

0_0_32000896_6015.cpp: In function 'int main()':
0_0_32000896_6015.cpp:16:27: error: 'sum' was not declared in this scope
           printf("%d\n\n",sum);
                           ^
0_0_32000896_6015.cpp:18:23: error: 'sum' was not declared in this scope
         printf("%d\n",sum);
                       ^