Constants in C

Constant in C means the content whose value does not change at the time of execution of a program.

C Constants are also like normal variables. But, the only difference is, their values can not be modified by the program once they are defined.
Constants refer to fixed values. They are also called as literals
Constants may be belonging to any of the data types.

A constant is a value or an identifier whose value cannot be altered in a program.

Constants refer to fixed values that the program may not alter during its execution. These fixed values are also called literals.
Constants can be of any of the basic data types like an integer constant, a floating constant, a character constant, or a string literal. There are enumeration constants as well.
Constants are treated just like regular variables except that their values cannot be modified after their definition.

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Different Types of C Constants

Constant	Type of Value Stored
Integer Constant	Constant which stores integer value
Floating Constant	Constant which stores float value
Character Constant	Constant which stores character value
String Constant	Constant which stores string value

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Declare Constant in C

We can declare constant using const variable.

Declaration	Explanation
const int a = 10;	read as “a is an integer which is constant”
int const a = 10;	read as “a is a constant integer”

#include<stdio.h>
int main()
{
  int const x=10;
  float const y=20.50;
  char const c='w';

  x=20;//not allow
  y=10.40;//not allow
  c='v';//not allow
  
  return 0;
}

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