So frusterated, and dont understand

HI
Ok, i understand fully structures, how they work, when to use them etc. And i understand enumerated data types. The problem is i have no clue when to use enumerated daya types. Why use a enum when you can use a structure or vise versa. i don't know when to use enumerated data types their confusing me

link

Here's a good example of a use of enum:

http://www.matcmp.sunynassau.edu/~sh...ssdoc/enum.htm