Chapter 4.1, Problem 12SCP

Explanation of Solution

Given code snippet:

//create an object

Scanner console =new Scanner(System. in);

//print the statement

System out print( "How much will John be spending?") ;

//The input provided by user is stored in amount

double amount= console.nextDouble() ;

//print the statement

System.out.println();

//evaluate the values and store in numBills1

int numBills1 = (int) (amount / 20.0) ;

//condition initialized to check whether the value is less than the value of amount

if (numBills1 * 20.0 < amount) {

    //increment the variable  

    numBills1++;

}

//print the statement

System.out.print( "How much will Jane be spending? " );

//The input provided by user is stored in amount

amount=console.nextDouble();

//print the statement

System.out. println();

//evaluate the values and store in numBills2

int numBills2= (int) (amount / 20.0);

//condition initialized to check whether the value is less than the value of amount

if (numBills2 * 20.0 < amount)

{

    //increment the variable

    numBills2++;

}

//print the statements

System.out.println( " John needs " + numBillsl + " bills " );

System.out.println( " Jane needs " + numBills2 + " bills" );

Error in the above code:

• In the given code snippet, the reports for two persons are separated using the same variables twice.
• This can be decreased by defining a method to get the bills of the individuals.
• The resultant values can be calculated in the same method and this will decrease the confusion and redundancy.
• The following changes in the code may rectify the errors:

The refactored code snippet:

//import the required packages

import java.util.*;

//define a class

public class Bills {

    //define the static function

    public static void main(String[] args) {

        //create an object

        Scanner console = new Scanner(System...