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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