/in/foo.cc: In function 'int main()':
/in/foo.cc:6:7: error: expected unqualified-id before 'int'
 int n,int i;
       ^~~
/in/foo.cc: In function 'void Output()':
/in/foo.cc:16:16: error: 'n' was not declared in this scope
  for(int i=0;i<n;i++)
                ^
/in/foo.cc:17:7: error: 'a' was not declared in this scope
 cout<<a[i]<<" ";
       ^