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Java Exercises: 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: 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:

java: area of a rectangle

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);
    }
}

Sample Output:

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

Flowchart:

Flowchart: Java exercises: Print the area and perimeter of a rectangle

Java Code Editor:

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Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
       
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
                System.exit(0);
                }
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        System.out.println(err);
        System.exit(1);
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC