/in/foo.cc:4:2: error: expected initializer before 'double'
  double a[10]={28.9,32.7,45.6,78,35,86.2,27.8,43,56,65}
  ^~~~~~
/in/foo.cc:6:2: error: expected unqualified-id before 'for'
  for(int i=0;i<10;i++)
  ^~~
/in/foo.cc:6:14: error: 'i' does not name a type
  for(int i=0;i<10;i++)
              ^
/in/foo.cc:6:19: error: 'i' does not name a type
  for(int i=0;i<10;i++)
                   ^
/in/foo.cc:12:8: error: expected constructor, destructor, or type conversion before '(' token
  printf("%.2lf",ans);
        ^
/in/foo.cc:13:2: error: expected unqualified-id before 'return'
  return 0;
  ^~~~~~
/in/foo.cc:14:1: error: expected declaration before '}' token
 }
 ^