Convert to dollars in Java / How to Tutorial

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Convert to dollars
Given four values representing counts of quarters, dimes, nickels and pennies, output the total amount as dollars and cents.

Output each floating-point value with two digits after the decimal point, which can be achieved as follows:

Ex: If the input is:

4 3 2 1
where 4 is the number of quarters, 3 is the number of dimes, 2 is the number of nickels, and 1 is the number of pennies, the output is:

Amount: $1.41
For simplicity, assume input is non-negative.
Code

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

double dollars = (qtr*0.25)+(dime*0.10)+(nickle*0.05)+(penny*0.01);
}
}