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

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