The program is used to read a floating point value then compute “y” and display “x”, “y”, product of “x” and “y” and also subtract “1” from product of “x” and “y” then display the result as follows:

Program:

//include required header files

import java.util.Scanner;

//definition of "Approximation" class

public class Approximation

{

    //definition of main method

    public static void main(String[] args)

    {

        //create an object for scanner

        Scanner keyboard = new Scanner(System.in);

        //declare the required variable

        float x = 0, y;

        //get the input from the user

System.out.println("Enter a floating point value.");

        x = keyboard.nextFloat();

        //calculate "y" value

        y = (float) (1.0/x);

        //display "x" and "y" value

        System.out.println("x value is: "+ x);

        System.out.println("y value is: "+ y);

        //display product of "x" and "y"

System.out.println("Product of x and y is: "+ (x*y));

/*subtract 1 from product of "x" and "y" and display the result*/

System.out.println("The difference of x*y and 1 is " + ((x*y) - 1.0));    

    }

}

 Conclusion:

 The “x” depends on user but the product of “x” and “y” will always give “1” and difference of “x * y” and “1” is always “0” because, “1” is divided by “y” and then “y” is multiplied with the “x”. So there is no change in product of “x” and “y” and difference of “x * y” and “1”.

Output:

Enter a floating point value.

2.5

x value is: 2.5

y value is: 0.4

Product of x and y is: 1.0

The difference of x*y and 1 is 0.0