/in/foo.cc:9:6: error: array bound is not an integer constant before ']' token
 }ob[n];
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:17:8: error: 'ob' was not declared in this scope
   cin>>ob[i].name>>ob[i].price>>ob[i].num;
        ^