Homework - Java Program

Hi there. I'm wondering if anyone can help me here. I believe I've got the basics... but can't figure out how to complete it. Here's what it SHOULD do:

Write a Java program to collect the sales data from three stores of a given company. The program will ask the user to enter the number of items sold at each store. The program should display a bar chart to illustrate the sales at each store. A bar chart is a row of printed asterisks -- each asterisk represents the sale of one item. To make the bar chart easier to read, every tenth asterisk is replaced by an 'x'. Here is a sample run of the program:

Enter today's sales for store 1: 27
Enter today's sales for store 2: 15
Enter today's sales for store 3: 34

SALES BAR CHART

Store 1: *********x*********x*******
Store 2: *********x*****
Store 3: *********x*********x*********x****
Your program should validate the data entered for each store. The store data should be a value zero or greater (i.e., reject negative values). Here is a sample run of the program in which the user attempted to enter invalid data for store 2 -- eventually the user entered the valid value of 23:
Enter today's sales for store 1: 9
Enter today's sales for store 2: -2
Invalid input - enter a value of zero or greater: -1
Invalid input - enter a value of zero or greater: 23
Enter today's sales for store 3: 16

SALES BAR CHART

Store 1: *********
Store 2: *********x*********x***
Store 3: *********x******
Start with the following code -- add your code to the main method:

import java.util.Scanner;

public class BarChart
{
public static void main(String [] args)
{

}
}



Here is what I have:

import java.util.Scanner;

public class BarChart
{
public static void main(String [] args)
{

int store1;
int store2;
int store3;
int bar1;
int bar2;
int bar3;



// Create a Scanner object to read input.
Scanner keyboard = new Scanner(System.in);



System.out.print("Enter today's sales for store 1: ");
store1 = keyboard.nextInt();

while (store1 < 0)
{
System.out.print("Invalid input - enter a value of zero or greater: "); // Completion of WHILE loop for less than 0.
store1 = keyboard.nextInt();
}


System.out.print("Enter today's sales for store 2: ");
store2 = keyboard.nextInt();

while (store2 < 0)
{
System.out.print("Invalid input - enter a value of zero or greater: "); // Completion of WHILE loop for less than 0.
store2 = keyboard.nextInt();
}

System.out.print("Enter today's sales for store 3: ");
store3 = keyboard.nextInt();

while (store3 < 0)
{
System.out.print("Invalid input - enter a value of zero or greater: "); // Completion of WHILE loop for less than 0.
store3 = keyboard.nextInt();
}




System.out.println("\n\nSALES BAR CHART\n\n");
bar1 = store1/100;
System.out.println("store 1 : ");
for(int i = 1; i <= bar1; i++)
System.out.println("*");

bar2 = store2/100;
System.out.println("\nStore 2 : ");
for(int i = 1; i <= bar2; i++)
System.out.println("*");

bar3 = store3/100;
System.out.println("\nStore 3 : ");
for(int i = 1; i <= bar3; i++)
System.out.println("*");

}
}


Everything works, but this is what I get on a run:

Enter today's sales for store 1: 12
Enter today's sales for store 2: 15
Enter today's sales for store 3: 22


SALES BAR CHART


store 1 :

Store 2 :

Store 3 :


I'm thoroughly lost on the asterick/plus part. If anyone could offer advice, or point me in the right direction, I'd really really appreciate it.

Okay, a little bit closer.. Issue is revolving around the asterick bar chart.

updated code:

System.out.println("\n\nSALES BAR CHART\n\n");
bar1 = store1;
System.out.print("store 1 : ");
for(int i = 1; i <= bar1; i++)
System.out.print("*");

bar2 = store2;
System.out.print("\nStore 2 : ");
for(int i = 1; i <= bar2; i++)
System.out.print("*");

bar3 = store3;
System.out.print("\nStore 3 : ");
for(int i = 1; i <= bar3; i++)
System.out.print("*");



Ouput:

Enter today's sales for store 1: 22
Enter today's sales for store 2: 45
Enter today's sales for store 3: 7


SALES BAR CHART


store 1 : **********************
Store 2 : *********************************************
Store 3 : *******

It seems this is factored off maybe modulus? i%10 to break down, then everytime i=0 print an x? That works in my mind.. but I don't know what process to do to actually make this do what I want. Any suggestions?

Figured it out.. Don't think it's the CLEANEST way.. but it gets the job done.. nested FOR loop with an IF/ELSE clause:

System.out.println("\n\nSALES BAR CHART\n\n");
bar1 = store1;
System.out.print("store 1 : ");
for(int i = 1; i <= bar1; i++)

if (i%10 >=1)
System.out.print("*");
else
System.out.print("x");


bar2 = store2;
System.out.print("\nStore 2 : ");
for(int i = 1; i <= bar2; i++)

if (i%10 >=1)
System.out.print("*");
else
System.out.print("x");


bar3 = store3;
System.out.print("\nStore 3 : ");
for(int i = 1; i <= bar3; i++)

if (i%10 >=1)
System.out.print("*");
else
System.out.print("x");


Completed:
Enter today's sales for store 1: -5
Invalid input - enter a value of zero or greater: -4
Invalid input - enter a value of zero or greater: 12
Enter today's sales for store 2: -45
Invalid input - enter a value of zero or greater: -5
Invalid input - enter a value of zero or greater: 33
Enter today's sales for store 3: -4
Invalid input - enter a value of zero or greater: 106


SALES BAR CHART


store 1 : *********x**
Store 2 : *********x*********x*********x***
Store 3 : *********x*********x*********x*********x*********x*********x*********x*********x*********x*********x ******
----jGRASP: operation complete.

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