Thread: Program crashes when user input's decimals

 
import javax.swing.*; // import the swing library for I/O
 
class change
{
    public static void main (String[] param)
    {
 
      	changedue();
        System.exit(0);
 
    } // END main
 
	public static void changedue()
	{
	String textinput;
	String textinput1;
	String value1;
	int sale = 0;
	int amount = 0;
	int chnge = 0;
	int f, twenty, ten, five, one;
	int price;
	int cost = 0;
	int change1;
 
   	f = 0;
    	twenty = 0;
    	ten = 0;
    	five = 0;
    	one = 0;
 
	{
	textinput = JOptionPane.showInputDialog("Please enter the amount of the sale");
	cost = Integer.parseInt(textinput);
	textinput1 = JOptionPane.showInputDialog(null, "Please enter the amount the customer paid in");
	price = Integer.parseInt(textinput1);
	change1 = (price - cost) * 100; 
 
	System.out.println(change1);
 
    if (change1 >= 50)
    {
	f = change1 / 50;
	double d = Math.floor(f);  
	change1 = change1 - (f * 50); 
    } 
    while (change1 >= 20)
    {
        twenty = change1 / 20;
	double d = Math.floor(twenty);
        change1 = change1 - (twenty * 20);
    }
    while (change1 >= 10)
    {
	ten = change1 / 10;
	double d = Math.floor(ten);
        change1 = change1 - (ten * 10);
    }
    while (change1 >= 5)
    {
	five = change1 / 5;
	double d = Math.floor(five);
        change1 = change1 - (five * 5);
    }
    while (change1 >= 1)
    {
 
	one = change1 / 1;
	double d = Math.floor(one);
        change1 = change1 - (one * 1);
    }
	System.out.println("number of one penny's" + one);
	System.out.println("number of five penny's" + five);
	System.out.println("number of ten penny's" + ten);
	System.out.println("number of twenty penny's" + twenty);
	System.out.println("number of fifty penny's" + f);
}
		}
     // END changedue
 
 
} // END class change

I get this error whenever I input a decimal number like 9.50, why? how can i stop this :S

Terminal spits out this when i do

Exception in thread "main" java.lang.NumberFormatException: For input string: "9.50"
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:492)
at java.lang.Integer.parseInt(Integer.java:527)
at change.changedue(change.java:36)
at change.main(change.java:9)

	public static void changedue()
	{
	String textinput;
	String textinput1;
	String value1;
	int sale = 0;
	int amount = 0;
	int chnge = 0;
	int f, twenty, ten, five, one;
	double price;
	double cost = 0;
	int change1;
 
   	f = 0;
    	twenty = 0;
    	ten = 0;
    	five = 0;
    	one = 0;
 
	{
	textinput = JOptionPane.showInputDialog("Please enter the amount of the sale");
	cost = Double.parseDouble(textinput);
	textinput1 = JOptionPane.showInputDialog(null, "Please enter the amount the customer paid in");
	price = Double.parseDouble(textinput1);
	change1 = (price - cost) * 100;

I added Double.parseDouble(textinput1); instead of the Interger parse...was this what you meant? and i changed price/cost from int to double
but i get this error now

error: possible loss of precision
change1 = (price - cost) * 100;
^
required: int
found: double