Chapter 1 Question 1.9, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Area and perimeter of a rectangle) Write a program that displays the area and perimeter of a rectangle with the width of 4.5 and height of 7.9 using the following formula: 

            area = width * height

Answer

/**

Program - 09

(Area and perimeter of a rectangle)

Write a program that displays the area and perimeter of a rectangle with the width of 4.5 and height of 7.9 using the following formula:

            area = width * height

   

**/

public class HelloWorld

{

    public static void main(String args[])

    {    

   

        System.out.println("Area = ");

        System.out.println(4.5 * 7.9);

        System.out.println("Perimeter = ");

        System.out.println((4.5 + 7.9) * 2);

    }

}

OUTPUT

Area =

35.550000000000004

Perimeter =

24.8

In this program the background knowledge which we have to acquire to solve this program is using:

1) Formula of Area = (length * breadth)

2) Formula of Perimeter = 2(length * breadth)

Note: As  System.out.println();  is used, therefore the value of Area and Perimeter gets printed in the new line.