Typedef: defining a type

typedef <type> <identifier> [ <size> ];

typedef defines a new type for use in the program. For example:

typedef float prices [20];

defines "prices" to be a new type consisting of an array of 20 float numbers.

notice that "prices" is not an array, it is just a type. It can be used to create an array later on. For example:

prices pricelist;

this declares a variable of type prices; i.e. pricelist is an array of 20 float numbers.

another possibility:

prices catalog [5];

in this case, catalog is an array of 5 elements; each one is an array of 20 floats.