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a.
Explanation of Solution
Program:
File name: “RetirementGoal.java”
//Import necessary header files
import java.util.Scanner;
//Define a class named RetirementGoal
public class RetirementGoal
{
//Define main method
public static void main (String[] args)
{
//Create an object for the Scanner class
Scanner input = new Scanner(System.in);
//Declare the variables
int years;
int saveAmount;
int total;
/*Prompt the user to enter the number of years the user
has until retirement */
System.out.print("How many years until retirement? >> ");
years = input.nextInt();
/*While condition if the user enters 0 or a negative number*/
while(years <= 0)
{
//Print the error message
System.out.println("Years cannot be 0 or negative");
//Reprompt the user to make a valid entry
System...
b.
Explanation of Solution
Program:
File name: “RetirementGoal2.java”
//Import necessary header files
import java.util.Scanner;
//Define a class named RetirementGoal2
public class RetirementGoal2
{
//Define main method
public static void main (String[] args)
{
//Create an object for the Scanner class
Scanner input = new Scanner(System.in);
//Declare the variables
int years;
int saveAmount;
int total;
final double RATE = 0.04;
/*Prompt the user to enter the number of years the user
has until retirement */
System.out.print("How many years until retirement? >> ");
years = input.nextInt();
/*While condition if the user enters 0 or a negative number*/
while(years <= 0)
{
//Print the error message
System.out.println("Years cannot be 0 or negative");
//Reprompt the user to make a valid entry
System.out.print("Please renter years >> ");
years = input.nextInt();
}
/*Prompt the user to enter the amount of money the user can save annually*/
System.out.print("How much can you save annually? >> ");
saveAmount = input.nextInt();
/*While condition if the user enters 0 or a negative number*/
while(saveAmount <= 0)
{
//Print the error message
System...
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