C Programming - Declarations and Initializations - Discussion

Give some expalnation please.

Someone explain briefly.

Can't understand.

typedef void DRAWF( int, int );
This example provides the type DRAWF for a function returning no value and taking two int arguments. This means, for example, that the declaration

DRAWF box;
is equivalent to the declaration

Can any one give best example for this ?

C provides a facility called typedef for creating new data type names. For example, the declaration

typedef int Length;

makes the name Length a synonym for int. The type Length can be used in declarations, casts, etc., in exactly the same ways that the int type can be:

Length len, maxlen;
Length *lengths[];

Similarly, the declaration

typedef char *String;

makes String a synonym for char * or character pointer, which may then be used in declarations and casts:

String p, lineptr[MAXLINES], alloc(int);
int strcmp(String, String);
p = (String) malloc(100);

Notice that the type being declared in a typedef appears in the position of a variable name, not right after the word typedef. Syntactically, typedef is like the storage classes extern, static, etc. We have used capitalized names for typedefs, to make them stand out.

Hope you got it!

Can anyone tell me what is enum error?

The typedef is a keyword in the C and C++ programming languages. The purpose of typedef is to assign alternative names to existing types, most often those whose standard declaration is cumbersome, potentially confusing, or likely to vary from one implementation to another.

Give explanation for this.

Enum is keyword like structure keyword.

(example)
you creat structure this way
struct (structure name)
{
(structure member or element)
} ;
same way using enum
(example)
enum (enum name)
{
(enum member or element)
};

So enum is keyword and error is enum name.