foo.cc: In function ‘int main()’:
foo.cc:7:14: error: expected ‘;’ before ‘sum’
    7 |         floor sum;
      |              ^~~~
      |              ;
foo.cc:7:18: error: statement cannot resolve address of overloaded function
    7 |         floor sum;
      |                  ^
foo.cc:12:17: error: ‘sum’ was not declared in this scope
   12 |                 sum+=a[i];
      |                 ^~~
foo.cc:14:39: error: ‘sum’ was not declared in this scope
   14 |         cout<<fixed<<setprecision(1)<<sum;
      |                                       ^~~