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Explain the constant type qualifier in C language
Type qualifiers add special attributes to existing datatypes in C programming language.
There are three type qualifiers in C language and constant type qualifier is explained below −
Const
There are three types of constants, which are as follows −
Literal constants
Defined constants
Memory constants
Literal constants − These are the unnamed constants that are used to specify data.
For example,
a=b+7 //Here ‘7’ is literal constant.
Defined constants − These constants use the preprocessor command ‘define" with #
For example, #define PI 3.1415
Memory constants − These constants use ‘C’ qualifier ‘const’, which indicates that the data cannot be changed.
The syntax is as follows −
const type identifier = value
For example,
const float pi = 3.1415
As, you can see that it simply gives a literal name.
Example
Following is the C program for constants type qualifier −
#include<stdio.h>
#define PI 3.1415
main ( ){
const float cpi = 3.14
printf ("literal constant = %f",3.14);
printf ("defined constant = %f", PI);
printf ("memory constant = %f",cpi);
}Output
When the above program is executed, it produces the following result −
literal constant = 3.14 defined constant = 3.1415 memory constant = 3.14
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