foo.cc:3:7: error: ‘n’ was not declared in this scope; did you mean ‘yn’?
    3 | int a[n];
      |       ^
      |       yn
foo.cc: In function ‘int main()’:
foo.cc:9:22: error: ‘a’ was not declared in this scope
    9 |                 cin>>a[i];
      |                      ^
foo.cc:11:23: error: ‘a’ was not declared in this scope
   11 |                 cout<<a[i]<<' ';
      |                       ^