typedef struct

Code:

---

typedef struct
{       
        int number;       
        int count;
}NUMBER;

---

what does this mean?

Code:

---

typedef this that;

---

makes "that" an alias for "this", as a type. So you can use a shorter or more descriptive name instead of the formal name.

so in this case, it creates a new data type "NUMBER" as an alias for "int number" and "int count".

so what about struct?

Well, no. "This" is

Code:

---

struct
{
    int number;
    int count;
}

---

and "that" is

Code:

---

NUMBER

---

hence NUMBER is now a synonym for the unnamed struct listed.