﻿ Java - Print the area and perimeter of a rectangle

# Java: Print the area and perimeter of a rectangle

## Java Basic: Exercise-13 with Solution

Write a Java program to print the area and perimeter of a rectangle.

Java: 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. Following image represents the perimeter of a rectangle. Java: Area of a rectangle

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. To find the area of a rectangle, multiply the length by the width.
A rectangle with four sides of equal length is a square.
Following image represents the area of a rectangle.

Pictorial Presentation: Sample Solution:

Java Code:

``````public class Exercise13 {

public static void main(String[] strings) {

final double width = 5.6;
final double height = 8.5;

double perimeter = 2*(height + width);

double area = width * height;

System.out.printf("Perimeter is 2*(%.1f + %.1f) = %.2f \n", height, width, perimeter);

System.out.printf("Area is %.1f * %.1f = %.2f \n", width, height, area);
}
}
```
```

Explanation:

In the exercise above -

• Define constant values for the rectangle's width (5.6) and height (8.5).
• Calculate the rectangle perimeter using the formula: 2 * (height + width).
• Calculate the rectangle area using the formula: width * height.
• Prints the perimeter and area values to the console using printf statements with formatted output to display the results with specific decimal precision.

Sample Output:

```Perimeter is 2*(8.5 + 5.6) = 28.20
Area is 5.6 * 8.5 = 47.60
```

Flowchart: Java Code Editor:

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## Java: Tips of the Day

DropElements

Removes elements in an array until the passed function returns true. Returns the remaining elements in the array.

Loop through the array, using Arrays.copyOfRange() to drop the first element of the array until the returned value from the function is true. Returns the remaining elements.

```public static int[] dropElements(int[] elements, IntPredicate condition) {
while (elements.length > 0 && !condition.test(elements)) {
elements = Arrays.copyOfRange(elements, 1, elements.length);
}
return elements;
}
```

Ref: https://bit.ly/37YWqzD

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