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 −
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
例如，
const float pi = 3.1415
如您所见，它只是给出一个字面名称。
以下是常量类型限定符的C程序：
#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);
}当上述程序被执行时，它产生以下结果 −
literal constant = 3.14 defined constant = 3.1415 memory constant = 3.14
以上是在C语言中，常量类型限定符用于指定一个变量是一个常量，即其值在初始化后不能被修改。常量类型限定符可以通过将关键字const放在变量声明前来实现。例如： const int x = 5; 在上述示例中，变量x被声明为一个常量，其值被初始化为5，并且不能在后续的代码中被修改。常量类型限定符的使用可以提高代码的可读性和可维护性，因为它明确地指示了变量的用途和限制的详细内容。更多信息请关注PHP中文网其他相关文章！
