Thread: Having a bit of trouble trying to loop my project.

public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
 
        //format number and currency
       NumberFormat NF = NumberFormat.getCurrencyInstance();
       NumberFormat NI = NumberFormat.getNumberInstance();
 
 
        double months = 1;
        double numyears;
        double loanamount;
        double rate;
 
 
 
       //put while statement here
 
        //prompt loan amount
        System.out.print("Enter Loan Amount:");                           
        loanamount = in.nextDouble();
 
        //prompt rate
        System.out.print("Enter Rate:");
         rate = in.nextDouble();
 
         //prompt years
        System.out.print("Enter Number of Years:");
        numyears = in.nextDouble();
 
 
      //calculation monthly
       monthlypay1 = loanamount * rate / (Math.pow(1 + rate, months)) / (Math.pow(1 + rate, months)-1);
 
 
        System.out.println("The Monthly Payment is: $" + monthlypay1);
 
 
        if (monthlypay1 < 0) {
            System.out.print("You need to enter positive numerical data!");}
        else {
            System.out.print("Would you like to continue calculations(y/n)?");
        }
            choice = in.next();
            System.out.println();
            n = False;
            if (choice.equals(n)) {
            }
            }
 
 
 
 
        }

Basically I am trying to loop this. I've tried adding a while statement

 while (n.equals( n) {

I've also tried while n == true basically trying to make a while statement to loop the whole thing so that at the end if the user selects "Y" it will loop them back. If the user selects "N" it will break them out the loop. Please help.

No sir, For the most part i've just been looking at tutorials on websites but they have not been helping much.

Ok so basically in my case I can change "int repeat = 0" to be repeat = y;
and while y.equals(true);?

Ah ok That was going to be my next question. Thanks a lot!

 
int repeat = 0;
 
  while (monthlypay1 < 0) {
            System.out.print("You need to enter positive numerical data!");}
        while (monthlypay1 > 0) {
            System.out.print("Would you like to continue calculations(y/n)?");
            choice = in.nextLine();
        }
        while (choice.equals("y")) { //insert loop here.}
while (choice.equal("n")) { break;}

Something like that?

Ok I used the code you had as a guideline .

public class Monthypayment2 {
    private static double monthlypay1;
    private static String choice;
    private static boolean n;
    private static String False;
    private static boolean y;
 
 
 
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
 
        //format number and currency
       NumberFormat NF = NumberFormat.getCurrencyInstance();
       NumberFormat NI = NumberFormat.getNumberInstance();
 
 
        double months = 1;
        double numyears;
        double loanamount;
        double rate;
 
       int repeat = 0;   //condition for loop
 
       do {
 
 
 
        //prompt loan amount
        System.out.print("Enter Loan Amount:");                           
        loanamount = in.nextDouble();
 
        //prompt rate
        System.out.print("Enter Rate:");
         rate = in.nextDouble();
 
         //prompt years
        System.out.print("Enter Number of Years:");
        numyears = in.nextDouble();
 
 
      //calculation monthly
       monthlypay1 = loanamount * rate / (Math.pow(1 + rate, months)) / (Math.pow(1 + rate, months)-1);
 
 
        System.out.println("The Monthly Payment is: $" + monthlypay1);
 
         y = true;
         n = false;
 
        if (monthlypay1 < 0) {
            System.out.print("You need to enter positive numerical data!");}
        else {
            System.out.print("Would you like to continue calculations(y/n)?");
            choice = in.nextLine();
        }
       } while (choice.equals("y"));
 
                while(choice.equals("n")) {
            break; }
               }
 
 
            }

And yea I did wanted if and else statement but one of my friends who tried to help me said I should use do-while loops.

Can anyone help me out with the math on here?

 //calculation monthly
       monthlypay1 = loanamount * rate / (Math.pow(1 + rate, months)) / (Math.pow(1 + rate, months)-1);

Is what I have.. But i'm not getting the correct numbers...
When i put in loan amount 100000, with a rate of 6%, and a yearly payment of 30 it should be 599.55$

I'll try that. Because I noticed every time that I did my math it came out incorrect numbers. When I compare my code to the formula they are the exact same. But maybe that will help Java make the calculations in the correct order. Thanks again!