:12:26: error: stray '\' in program
   12 |         cout<<double(sum)\n<<endl;
      |                          ^
: In function 'int main()':
:8:14: error: 'x' was not declared in this scope
    8 |         cin>>x;
      |              ^
:9:9: error: 'sum' was not declared in this scope
    9 |         sum+=x;
      |         ^~~
:11:15: error: 'sum' was not declared in this scope
   11 |         cout<<sum<<endl;
      |               ^~~