- 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
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- C Print ASCII Value
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- C Check Palindrome or Not
- C Check Armstrong or Not
- C Find Armstrong Numbers
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- C Find Profit Loss
- C Sum of their Square
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- C Print Total Digit in Number
- C Check Perfect Number
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- C Round Number to Integer
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- 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
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- C Add Two Matrices
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- C Transpose a Matrix
- C Multiply Two Matrices
- C Sum All Matrix Elements
- C Largest Element in Matrix
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- C 3D Array Programs
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- C Print String
- C Find Length of String
- C Compare Two String
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- C Count Vowels Consonants
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- C Delete Vowels from String
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- C Frequency of Character
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- C Sort String in Alphabetical
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- C Check Anagram or Not
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- Generate Random Numbers
- C Print Date Time
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- C Address of Variable
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- C Programming Tutorial
- C Tutorial

# C program to calculate the area and perimeter of a square

In this article, you will learn and get code for the program given below:

- Determine the area of a square.
- Find the area of a square using the function
- Find the perimeter of the square
- Find the Square Perimeter Using Function

#### How to Find the Area of a Square

To find the area of a square, use the simple formula **area = len*len** or **area = len ^{2}**.

**len**denotes the length of a square's side. All four sides of a square, as we all know, are the same length. Now let's go through the program given below.

## Area of the Square Program in C

To calculate the area of a square in C programming, you have to ask the user to enter the side length of the square and then perform the simple operation of multiplication of the given number with itself (the length of the square), as shown here in the following program:

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

Here is a sample run of the above program. This is a snapshot of the initial output:

Enter the length of the square, say 2.5, and press the ENTER key to see the area as shown in the snapshot of the final output given below:

#### Steps used in the above program

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

- Declare any two floating-point variables. Because the side length of a square may contain a decimal value,
- Receive the length of the square in the
**len**variable. - Perform a multiplication operation on the
**len**variable with itself, the initialize it to the**area**variable. - Simply print the
**area**value as output. - The variable
**area**indicates the area of the square on the output screen. - Here,
**%0.2f**is used to print the value of**area**up to 2 decimal places only.

## Find the area of a square using a user-defined function in C

Now let's create another program that does the same job as the previous program. Except this program is created using functions. Let's take a look at it:

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

This program produces the same output as the previous program.

#### How to Find the Perimeter of a Square

To find the perimeter of a square, use the formula **perimeter = 4*side**. Here, **side** indicates the length of a side of the square. To
calculate perimeter, we must first determine the square's boundary length. As a square has four sides of equal length, here we only have to ask for
side length and then just multiply it by 4. That will be the perimeter.

## Perimeter of the square program in C

Here is the program in C that calculates the perimeter of a square of given length (by the user at run-time).

#include<stdio.h> #include<conio.h> int main() { float len, perimeter; printf("Enter length of Square: "); scanf("%f", &len); perimeter = 4*len; printf("\nPerimeter = %0.2f", perimeter); getch(); return 0; }

When the above C program is compiled and executed, it will produce the following result:

You can clearly understand this program by yourself; nothing extra is included here. So I'm going to the next program, which uses a function to calculate the perimeter of a square.

## Find the perimeter of a square using a user-defined function in C

This is the final program of this article that does the same job as the previous program, that is, asks the user to enter the side length of a square and calculates the perimeter of the square, but this time using a function. Let's have a look at it:

#include<stdio.h> #include<conio.h> float findPeriSquare(float); int main() { float len, perimeter; printf("Enter length of Square: "); scanf("%f", &len); perimeter = findPeriSquare(len); printf("\nPerimeter = %0.2f", perimeter); getch(); return 0; } float findPeriSquare(float len) { return 4*len; }

This program produces the same output as the previous program did.

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