Chapter 6.3, Problem 30STQ

Explanation of Solution

Program:

File name: “OutputFormat.java”

//Define the class "OutputFormat"

public class OutputFormat

{

    //Define the method "write()"

private static void write(double number, int digitsAfterPoint)

    {

        //Check the condition

        if (number >= 0)

/*True, call the method "writePositive()"*/

            writePositive(number, digitsAfterPoint);

        //Otherwise

        else

        {

            //Assign the value

            double positiveNumber = -number;

            //Print statement

            System.out.print('-');

            //Call the method "writePositive()"

writePositive(positiveNumber, digitsAfterPoint);

        }

    }

    //Define the method "writePositive()"

    private static void writePositive(double number,

    int digitsAfterPoint)

    {

/*Call the method "Math.pow()" to move a decimal point*/

int mover = (int)(Math.pow(10, digitsAfterPoint));

        //Declare the variable

        int allWhole;

/*Call the method "Math.round()" to round the decimal point */

        allWhole = (int)(Math.round(number*mover));

        //Calculate the value of before decimal point

        int beforePoint = allWhole/mover;

        //Calculate the value of after decimal point

        int afterPoint = allWhole%mover;

        //Print the value of before point

        System.out.print(beforePoint);

        //Print the dot

        System.out.print('.');

        //Call the method "writeFraction()"

        writeFraction(afterPoint, digitsAfterPoint);

    }

    //Define the method "writeFraction()"

    private static void writeFraction(int afterPoint,

     int digitsAfterPoint)

    {

        //Variable initialization

        int n = 1;

        //Check the condition

        while (n < digitsAfterPoint)

        {

            //Check the condition

            if (afterPoint < Math...