number rounding - I'm not sure how to round this properly in my Java code -

i'm new java, , i've written code calculates how change need x amount of money payed y priced item. works well; issue whenever there not change owed in hundredths place (ex: $4.60), round down tenths place ($4.6).

if knows how fix this, grateful. have code posted below.

class main {     public static void main(string[] args) throws ioexception {        scanner scan = new scanner(system.in);        double x;       double y;       double z;        system.out.print("enter price of product: $");       x = scan.nextdouble();       system.out.print("enter payed with: $");       y = scan.nextdouble();       z = (int)math.round(100*(y-x));        system.out.print("change owed: $");       system.out.println((z)/100);        int q = (int)(z/25);       int d = (int)((z%25/10));       int n = (int)((z%25%10/5));       int p = (int)(z%25%10%5);        system.out.println("quarters: " + q);       system.out.println("dimes: " + d);       system.out.println("nickels: " + n);       system.out.println("pennies: " + p);      } } 

edit: thank answered question! ended going decimalformat solve it, , works great.

you can call this:

string.format("%.2f", i); 

so in case:

... system.out.print("change owed: $"); system.out.println((string.format("%.2f", z)/100)); ... 

string.format() useful whenever want round significant figures. in case "f" stands float.