How do you count how many times a if/when/for statement runs?

Question

So this new program I'm trying to write is a changemaker (in euros for some reason). You enter a price of a product, amount paid, and it computes how much change you should get back in the form
[number] x 2-euro
[number] x euro
[number] x 20-cent
etc
Where the number is the number of that kind of coin they should get back.
Right now, I have it so that you enter price, and amount paid, and then I have a series of while statements that go like..
while (surplus > 2.00);
while (surplus > 1.00);
etc. If the surplus > 2, I want to add 1 2-euro coin to the count, subtract 2, and then recheck the amount and either add another 2-euro or go onto the next coin. Only thing is, I don't know how to count how many times a while statement ran until it was false. Or I could be looking at this the wrong way entirely. What's the best way to go about a program like this?

Answer 1

Well I finally figured it out with lots of help from other students in the class. It was much easier than it appeared to be. Thanks for the hints everyone (especially joker for doing the coding for it) wow :D much appreciated ^^
Heres the code that I came up with and it works matches the assignment's example:
import java.util.* ;
public class ChangeMaker {
     private static int changeA [] = new int [7] ;
     private static float changeVar[] = new float [7] ;
     private static int changeVarNumb[] = new int [7] ;
     private static String changeNames[] = new String [7] ;
     // initialize Scanner
     private static Float getInput (String prompt){
          System.out.print (prompt.concat(" ")) ;
          Scanner sc1 = new Scanner (System.in) ;
          return (sc1.nextFloat ()) ;
     // put the change variables and change names into arrays
     private static void moneyArray (){
          changeVar[0] = (float) 2.0 ;
          changeVar[1] = (float) 1.00 ;
          changeVar[2] = (float) 0.20 ;
          changeVar[3] = (float) 0.10 ;
          changeVar[4] = (float) 0.05 ;
          changeVar[5] = (float) 0.02 ;
          changeVar[6] = (float) 0.01 ;
          changeVarNumb[0] = 2 ;
          changeVarNumb[1] = 1 ;
          changeVarNumb[2] = 20 ;
          changeVarNumb[3] = 10 ;
          changeVarNumb[4] = 5 ;
          changeVarNumb[5] = 2 ;
          changeVarNumb[6] = 1 ;
          changeNames[0] = (String) "Euro" ;
          changeNames[1] = (String) "Euro" ;
          changeNames[2] = (String) "Cent" ;
          changeNames[3] = (String) "Cent" ;
          changeNames[4] = (String) "Cent" ;
          changeNames[5] = (String) "Cent" ;
          changeNames[6] = (String) "Cent" ;
          return ;
     // calculate the change the user is going to receive
     private static void calcChange(float diffAmount) {
          for (int i = 0; i < changeVar.length ; i++) {
               if (diffAmount > changeVar) {
                    changeA[i] = (int)(diffAmount / changeVar[i]);
                    diffAmount = diffAmount - (changeA[i] * changeVar[i]) ;
                    System.out.println(changeA[i] + " x " + changeVarNumb[i] + " " + changeNames[i]) ;
          return;
     // output
     public static void main(String[] args) {
          float itemPrice = getInput("Enter product price: ") ;
          float amountTendered = getInput("Enter amount paid: ") ;
          float diffAmount = amountTendered - itemPrice ;
          System.out.println() ;
          System.out.println("Your change is " + diffAmount + " euros") ;
          moneyArray() ;
          calcChange(diffAmount) ;
And the output looks like this:
Enter product price:  2.32
Enter amount paid:  5.00
Your change is 2.68 euros
1 x 2 Euro
3 x 20 Cent
1 x 5 Cent
1 x 2 Cent
1 x 1 Cent