The problem
Write a program that asks the user to enter the amount that he or she has budgeted for a month. A loop should then prompt the user to enter each of his or her expenses for the month, and keep a running total. When the loop finishes, the program should display the amount that the user is over or under budget.
Breaking it down
public static void main(String[] args) {
// Create a DecimalFormat object to format output.
DecimalFormat dollar = new DecimalFormat("#,##0.00");
// Create a Scanner object for keyboard input.
Scanner keyboard = new Scanner(System.in);
// Get the budget amount.
System.out.print("Enter your budget for the month: ");
double monthlyBudget = keyboard.nextDouble();
// Get each expense, keep track of total.
double expense;
double totalExpenses = 0.0;
do {
// Get an expense amount.
System.out.print("Enter an expense, or a negative "
+ "number to quit: ");
expense = keyboard.nextDouble();
totalExpenses += expense;
} while (expense >= 0);
// Display the amount after expenses.
double balance = calculateAmountOverBudget(monthlyBudget, totalExpenses);
if (balance < 0) {
System.out.println("You are OVER budget by $"
+ dollar.format(Math.abs(balance)));
} else if (balance > 0) {
System.out.println("You are UNDER budget by $"
+ dollar.format(balance));
} else {
System.out.println("You spent the budget amount exactly.");
}
keyboard.close();
}
static double calculateAmountOverBudget(double monthlyBudget,
double totalExpenses) {
return monthlyBudget - totalExpenses;
}Output
Enter your budget for the month: 100
Enter an expense, or a negative number to quit: 10
Enter an expense, or a negative number to quit: 10
Enter an expense, or a negative number to quit: 10
Enter an expense, or a negative number to quit: 10
Enter an expense, or a negative number to quit: 10
Enter an expense, or a negative number to quit: -10
You are UNDER budget by $60.00Level Up
- Refactor the budget attributes into an object to represent an Budget. Use a constructor to set the variables and getters to get the values.
- There is a bug in the program when trying to quit, what is it?