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Purpose of type Declarations and Components of type Declarations

Type Declarations :

the type declaration statement is used to specify the type and attributes of derived type objects such as arrays, pointer and functions.

Purpose of type declarations :
  • Type declarations assist the compiler in identifying the object to which the name refers to.
  • In case, if no data types exist, there would be no type checking, which produces adverse effects on debugging and error checking. It also affects the program's reliability.
  • Absence of data types also affects the language's readability as the objects with distinctive characteristics are difficult to isolate.

Components of type declarations :

A type declarative statement involves the following components.

  • type - name : it refers to the name of already defined derived datatype.
  • attribute - list : it consists of one or more attributes separated by a comma.
Syntax : type-name attribute -list
Example : int a,b,c;

A type declaration statement must end with a semicolon(;), values can also be assigned to attributes as follows.

int a = 10, b = 5, c = 3;

The above type-declarative statement assigns the values 10, 5 and 3 to the int type variables a, b and c respectively.


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