typedef
Syntax:
typedef existing-type new-type;
The typedef keyword allows you to create a new alias for an existing data type.
This is often useful if you find yourself using a unwieldy data type -- you can use typedef to create a shorter, easier-to-use name for that data type. For example:
typedef unsigned int* pui_t; // data1 and data2 have the same type piu_t data1; unsigned int* data2;