It is an variable whose value can not be changed at the execution time of program. In general constant can be used to represent as fixed values in a C program.

  • Types of Constants in C

    Types of Constants in C

    If any single character (alphabet or numeric or special symbol) is enclosed between single qotes ' ' known as single character constant.

    If set of characters are enclosed between double cotes " " known as string character constant.

  • How to create constant in C

    There are two ways to define constant in C programming.

    1) const keyword

    2) #define preprocessor

  • 1) C const keyword

    The const keyword is used to define constant in C programming.

    Example)
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    const float PI=3.14;
  • Example of making constant using const keyword

    • fig

      Example-of-making-constant-using-const-keyword5041150048219.jpg
  • 2) C #define preprocessor

    The #define preprocessor is also used to define constant


    Let's see an example of #define to define a constant.

    
    #include <stdio.h>  
    #define PI 3.14  
    void main() {  
       printf("%f",PI);  
    getch();
    }  

    Output:
    3.140000

What next?

The next topic is Operators in C

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