C Program to Find Area of Square using Macro

This is a simple demonstration of a Macro in C language. This is program is written using Turbo C++ Compiler installed on a Windows XP 64-bit system. You can compile and run this program using an standard C compiler.


This program is intended for intermediate level learners who know how to write a complex C program.

Problem Definition

The program to compute the area of a square use a C macro called ” area (r) r * r “ where r is a parameter which can be replaced with any variable.


Macro code gets replaced directly where they appear within the program and then executed as regular C tokens.

The area(r) receives a variable value called “Length_of_Side” for a square and computes the area of a square.

Program Code

/* Program to find area of square using Macro in c */

#include <stdio.h>

#include <stdlib.h>

#define area(r) (r * r)


    int length_of_side;
    int area_of_square;

/* Read the Length of Side of a Square */

    printf("Enter the length of side in 'cm' of a Square:");

/* Calling Macro area(r) where r is length_of_side */

    area_of_square = area(length_of_side);

    printf("Area of Square = %d",area_of_square);

    return 0;



Enter the length of side in 'cm' of a square:12
Area of Square = 144cm(square)


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