# C Exercises: Compute the perimeter and area of a rectangle

## C Basic Declarations and Expressions: Exercise-5 with Solution

Write a C program to compute the perimeter and area of a rectangle with a height of 7 inches and width of 5 inches.

**C programming: Perimeter of a rectangle**

A perimeter is a path that surrounds a two-dimensional shape. The word comes from the Greek peri (around) and meter (measure). The perimeter can be used to calculate the length of fence required to surround a yard or garden. For rectangles or kites which have only two different side lengths, say x and y, the perimeter is equal to 2x + 2y

**Pictorial Presentation:**

**C programming: Area of a rectangle**

The area of a two-dimensional figure describes the amount of surface the shape covers. You measure area in square units of a fixed size, square units of measure are square inches, square centimeters, or square miles etc. The formula for the area of a rectangle uses multiplication: *length • width = area*. A rectangle with four sides of equal length is a square.

**Pictorial Presentation:**

**C Code:**

```
#include <stdio.h>
/*
Variables to store the width and height of a rectangle in inches
*/
int width;
int height;
int area; /* Variable to store the area of the rectangle */
int perimeter; /* Variable to store the perimeter of the rectangle */
int main() {
/* Assigning values to height and width */
height = 7;
width = 5;
/* Calculating the perimeter of the rectangle */
perimeter = 2*(height + width);
printf("Perimeter of the rectangle = %d inches\n", perimeter);
/* Calculating the area of the rectangle */
area = height * width;
printf("Area of the rectangle = %d square inches\n", area);
return(0);
}
```

**Explanation:**

In the exercise above -

- The program includes the standard input/output library <stdio.h>.
- It declares several integer variables:
- width: Represents the rectangle width in inches.
- height: Represents the height of the rectangle in inches.
- area: Will store the calculated rectangle area.
- perimeter: Will store the calculated rectangle perimeter.
- In the "main()" function:
- It assigns the values 7 to the 'height' variable and 5 to the 'width' variable, representing the rectangle's dimensions.
- The program then calculates the rectangle's perimeter and area:
- Perimeter: It uses the formula 2 * (height + width) to calculate the perimeter of the rectangle and stores the result in the 'perimeter' variable.
- Area: It calculates the area using the formula height * width and stores the result in the 'area' variable.
- Finally, the program uses the "printf()" function to display the calculated values:
- It prints the calculated perimeter with a message: "Perimeter of the rectangle = [perimeter] inches."
- It prints the calculated area with a message: "Area of the rectangle = [area] square inches."
- The program returns 0 to indicate successful execution.

Sample Output:

Perimeter of the rectangle = 24 inches Area of the rectangle = 35 square inches

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**Next:** Write a C program to compute the perimeter and area of a circle with a given radius.

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