View Compilation Error

0_0_28307500_20934.cpp: In function 'int main()':
0_0_28307500_20934.cpp:7:2: error: expected unqualified-id before 'double'
  double sum;
  ^
0_0_28307500_20934.cpp:10:2: error: 'sum' was not declared in this scope
  sum=0;
  ^