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  Named Constants

Introduction to Named Constants

There  are some  programming  languages that  provide the feature of named  constants. Some even  allow  to define named  constant expressions. As  such a named constant is defined as. A constant is a data object with a name which  is bound  to a value  ( or value) permanently during its  lifetime.

Since the value  of a named constant is bound to its  name  permanently during  its lifetime. This information is known at the translation time ( or compile time) not at the  execution time. So named constants are assigned their values at the  compile time only  so that it  can save the execution time. These named  constants may not  by redefined during  execution time . some  related issue of a named   constants may  discussed below as:

(a) This feature is provided  in some  of the programming  language like C.

Example 35. In C if  programming writes:

#define  MAX 20

Then  this statement  is called a macro definition  or just  during pre processing  the pre processor  replaces every occurrence of MAX  in the program with 20 and this information is know at compile time  only.  C compiler  may make use of this information  knowing  that the  value  may not be altered. Like the assignment  statement MAX= 5 would  be illegal  since MAX is always  the  constant 20.

(b) Named  constants aids in the  modification of the program so we can  change values  of  a named constant at all the places in a program by just making a  change in the # define  directive. So the change will be  made automatically  to all occurrences of  that  constant  before beginning the compilation.

(c) Next aspect of  named constant  is that  it helps in program  readability.

(d) In particular  it can be used to define  singly identifiers that are equivalent  to expressions, complete statements or groups  of statement.

Named constants  are customarily placed at the beginning  of a file. Their  scope  extends  from its  point  of definition to the end of life.

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