Question

How to create a program Budget

Enter the amount budgeted for the month: 400

Enter the expense (-1 to quite):100

Enter the expense (-1 to quite):-1

$400 budgeted.

1 expenses totaling $100.

$300 under budget.

Need to use sentinel value of -1, while loop

Answer 1

Program in java:

//importing class for user input
import java.util.Scanner;
//class declaration
public class Budget
{
   //main method
   public static void main(String args[])
   {
       //variables
       int budget,amt,totamt=0,count=0;
       //creating object for taking user input
       Scanner inp=new Scanner(System.in);
       //asking for user input
       System.out.print("Enter the amount budgeted for the month: ");
       //storing the value provided by user
       budget=inp.nextInt();
       //using do while loop to write the logic
       do
       {
           //asking for the expenses from user
           System.out.print("Enter the expense (-1 to quite): ");
           //storing user input
           amt=inp.nextInt();
           //if the passed value is not sentinel
           if(amt!=-1)
           {
               //increment the count
               count++;
               //reassign the total
               totamt=totamt+amt;
           }
       //checking for sentinel case to exit the loop
       }while(amt!=-1);
       //printing the results
       System.out.println("$"+budget+" budgeted.");
       System.out.println(count+" expenses totaling $"+totamt);
       System.out.println("$"+(budget-totamt)+" under budget.");
   }
}

Output: