typedef keyword in C allows you to defined new types.
Starting from the built-in C types, we can create our own types, using this syntax:
typedef existingtype NEWTYPE
The new type we create is usually, by convention, uppercase.
This it to distinguish it more easily, and immediately recognize it as type.
For example we can define a new
NUMBER type that is an
typedef int NUMBER
and once you do so, you can define new
NUMBER one = 1;
Now you might ask: why? Why not just use the built-in type
typedef gets really useful when paired with two things: enumerated types and structures.