- C Programming Examples
- C Programming Examples
- C Print Hello World
- C Get Input from User
- C Print Integer
- C Add Two Numbers
- C Add Subtract Multiply Divide
- C Add n Numbers
- C Area Perimeter of Square
- C Area Perimeter of Rectangle
- C Area Circum of Circle
- C Fahrenheit to Celsius
- C Celsius to Fahrenheit
- C Inches to Centimeters
- C Kilogram to Gram
- C Reverse a Number
- C Swap Two Numbers
- C Interchange Numbers
- C Print ASCII Value
- C Print Fibonacci Series
- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
- C Find nCr and nPr
- C Find Profit Loss
- C Sum of their Square
- C First & Last Digit Sum
- C Sum of All Digit
- C Product of All Digit
- C Print Total Digit in Number
- C Check Perfect Number
- C Find Basic Gross Salary
- C Round Number to Integer
- C Print Series upto n Term
- C Find Factors of Number
- C if-else & Loop Programs
- C Check Even or Odd
- C Check Prime or Not
- C Check Alphabet or Not
- C Check Vowel or Not
- C Check Leap Year or Not
- C Is Reverse Equal Original
- C Make Calculator
- C Add Digits of Number
- Count Positive Negative Zero
- C Largest of Two Numbers
- C Largest of Three Numbers
- C Smallest of Two Numbers
- C Smallest of Three Numbers
- C Find Factorial of Number
- C Find LCM & HCF
- C Find LCM of n Numbers
- C Find HCF of n Numbers
- C Find Arithmetic Mean
- C Find Average, Percentage
- C Find Student Grade
- C Print Table of Number
- C Print Prime Numbers
- C Find Discount Purchase
- C Calculate Parcel Charge
- C Calculate Wage of Labor
- C Print Phone Bill
- C Conversion programs
- C Decimal to Binary
- C Decimal to Octal
- C Decimal to Hexadecimal
- C Binary to Decimal
- C Binary to Octal
- C Binary to Hexadecimal
- C Octal to Decimal
- C Octal to Binary
- C Octal to Hexadecimal
- C Hexadecimal to Decimal
- C Hexadecimal to Binary
- C Hexadecimal to Octal
- C Pattern Programs
- C Pattern Printing Programs
- C Print Diamond Pattern
- C Print Floyd's Triangle
- C Print Pascal's Triangle
- C Array Programs
- C 1D Array Programs
- C Linear Search
- C Binary Search
- C Largest Element in Array
- C Smallest Element in Array
- C Second Largest/Smallest
- C Count Even Odd
- C Array Element at Even
- C Array Element at Odd
- C Print Even Array Elements
- C Print Odd Array Elements
- C Sum/Product of Even/Odd
- C Reverse an Array
- C Insert Element in Array
- C Delete Element from Array
- C Merge Two Arrays
- C Bubble Sort
- C Selection Sort
- C Insertion Sort
- C Print Common Elements
- C 2D Array Programs
- C Add Two Matrices
- C Subtract Two Matrices
- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
- C Print Row Column Total
- C 3D Array Programs
- C String Programs
- C Print String
- C Find Length of String
- C Compare Two String
- C Copy a String
- C Concatenate String
- C Reverse a String
- C Count Vowels Consonants
- C Replace Vowel in String
- C Delete Vowels from String
- C Delete Word from String
- C Frequency of Character
- C Count Word in String
- C Remove Spaces from String
- C Sort a String
- C Sort String in Alphabetical
- C Sort Words in Ascending
- C Sort Words in Descending
- C Uppercase to Lowercase
- C Lowercase to Uppercase
- C Swap Two Strings
- C Check Anagram or Not
- C Check Palindrome String
- C Print Number in Words
- C Print Successive Character
- C Character without Space
- C File Programs
- C Read a File
- C Write Content to File
- C Read & Display File
- C Copy a File
- C Merge Two Files
- C Reverse File
- C Count All Character in File
- C List Files in Directory
- C Encrypt & Decrypt a File
- C Delete a File
- C Misc Programs
- Generate Random Numbers
- C Print Date Time
- C Print Message with Time
- C Get IP Address
- C Print Smiling face
- C Pass Array to Function
- Add Two Numbers using Pointer
- C Address of Variable
- C Shutdown Computer
- C Programming Tutorial
- C Tutorial

# Find the Area and Perimeter of a Rectangle in C

In this article, you will learn and get code for calculating the area and perimeter of a rectangle. Here is the list of programs described in this article:

- Rectangle Area Calculation Program
- Using Function, Create a Program to Determine the Area of a Rectangle
- Rectangle Perimeter Calculation Program
- Using Function, Create a Program to Determine the Perimeter of a Rectangle

#### How to Calculate the Area of a Rectangle

To calculate the area of any rectangle, use the formula **area = len*bre**. Here, **len** is the length and **bre** is the breadth of the
rectangle.

## Rectangle Area Calculation Program in C

The question is, "Write a program in C to calculate the area of a rectangle." The length and breadth of the rectangle must be defined by the user. The answer to this question is given below:

#include<stdio.h> #include<conio.h> int main() { float len, bre, area; printf("Enter Length of Rectangle: "); scanf("%f", &len); printf("Enter breadth of Rectangle: "); scanf("%f", &bre); area = len*bre; printf("\nArea = %0.2f", area); getch(); return 0; }

This program is compiled and executed in the Code::Blocks IDE. Here is the first snapshot of a sample run produced by the above program:

Now enter any input as a rectangle length, say 2.5, and press the ENTER key.Again, supply the breadth of the rectangle, say 3, and press the ENTERÂ key to see the output as shown in the snapshot given below:

#### Steps involved in the previous program

Here is the list of some main steps used in the previous program:

- Declare any three floating-point variables.
- Here, all three variables are declared as floating-point types because they can handle real numbers or numbers that contain a decimal point.
- Now receive the length of the rectangle in the
**len**variable. - Again, receive the breadth of the rectangle in the
**bre**variable. - Apply the formula to calculate the area of a rectangle, that is,
**len*bre**, and initialize it to the**area**variable. - Print the value of the
**area**variable that shows the area of the rectangle. - Here, the format specifier
**%0.2f**is used to print the value of the**area**variable up to to 2 decimal places only.

## Area of Rectangle Program in C Using Function

Let's create another program that does the same job as the previous program. The only difference is that the previous program found the area of a rectangle without using a function, but this program uses a user-defined function to find the area of a rectangle as given below:

#include<stdio.h> #include<conio.h> float findAreaFun(float, float); int main() { float len, bre, area; printf("Enter Length of Rectangle: "); scanf("%f", &len); printf("Enter breadth of Rectangle: "); scanf("%f", &bre); area = findAreaFun(len, bre); printf("\nArea = %0.2f", area); getch(); return 0; } float findAreaFun(float l, float b) { return l*b; }

This program produces the same output as the previous program.

#### How to Calculate the Perimeter of a Rectangle

To calculate the perimeter of a rectangle, use the formula **perimeter = 2*(len+bre)**. Here, **len** indicates the length and
**bre** indicates the breadth of the rectangle.

A rectangle's perimeter is the length of its boundary. And there are four boundaries of a rectangle, in which the two adjacent boundaries are equal
to their opposite boundaries. To calculate perimeter, we can also write the above formula as **perimeter = len+len+bre+bre**.

## Perimeter of the Rectangle Program in C

The question is: write a program in C that prints the perimeter of a rectangle. The user must specify the length and width of the rectangle. The answer to this question is given below:

#include<stdio.h> #include<conio.h> int main() { float len, bre, perimeter; printf("Enter Length of Rectangle: "); scanf("%f", &len); printf("Enter Breadth of Rectangle: "); scanf("%f", &bre); perimeter = 2*(len+bre); printf("\nPerimeter = %0.2f", perimeter); getch(); return 0; }

Here is a sample run of the above program:

Now, one by one, supply any two inputs as the length and breadth of a rectangle, say 2.5 (as length) and 3.5 (as breadth). Press the ENTERÂ key to see the output as shown in the snapshot given below:

## Rectangle Perimeter in C Using Function

Here is the last program of this article. This program does the same job as the previous program. The only difference in coding for this program is that it is built around a function that calculates the perimeter of a rectangle. Consider the following:

#include<stdio.h> #include<conio.h> float findPerimeterFun(float, float); int main() { float len, bre, perimeter; printf("Enter Length of Rectangle: "); scanf("%f", &len); printf("Enter Breadth of Rectangle: "); scanf("%f", &bre); perimeter = findPerimeterFun(len, bre); printf("\nPerimeter = %0.2f", perimeter); getch(); return 0; } float findPerimeterFun(float l, float b) { return 2*(l+b); }

The output of the preceding program is identical to that of the previous program.

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