C programming

Constants

As the name suggests, a constant in C is a variable that cannot be modified once it is declared in the program. We can not make any change in the value of the constant variables after they are defined.

Types of constants In C

Syntax to define constant

const data_type var_name = value;

Examples :

Defining using #define preprocessor

We can also define a constant in C using #define preprocessor. The constants defined using #define are macros that behave like a constant. These constants are not handled by the compiler, they are handled by the preprocessor and are replaced by their value before complication.

Program:

    #include<stdio.h>
                
                            // C Program to define a constant using #define
                            #include <stdio.h>
                            #define pi 3.14
                             
                            int main()
                            {
                             
                                printf("The value of pi: %.2f", pi);
                                return 0;
                            }

Resources :

Test Your Knowledge

Choose The

With supporting text below as a natural lead-in to additional content.

Q1. A variable name can have ?

A. Any special symbol

B. Blank space

C. Comma ( , )

D. Underscore

Q2. Which pair of symbols is used to define the scope of functions, loops, and other code blocks in C?

A. ( )

B. { }

C. [ ]

D. < >

Getting Started With C

Constants

Examples :

Resources :

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