what is Double here?

Question

I understand double as a variable type but in line 4 it might be used as datatype conversion. I just don't get the double used in line 6, am I completely missing the point here?

public static void main(String args[]) {
    int discountPercentage = 10;
    double totalPrice = 800;
    double priceAfterDiscount = totalPrice * (1 - ((double) discountPercentage / 100));
    if (totalPrice > 500) {
        priceAfterDiscount = priceAfterDiscount * (1 - ((double) 5 / 100));
    }
    System.out.println("Customer has paid a bill of amount: "+ priceAfterDiscount);
}

Tip: Instead of casting, you could change those numeric literals from `int` to `double` by appending a `d` or `D`. Like this: `10d`, `800d`, `500d`, `1d`, `5d`, and `100d`. — Basil Bourque, Aug 24 '21 at 17:03

azro · Accepted Answer · 2021-08-24T16:53:01.270

1

Writing 5 / 100 is an int division as both operand are ints, and in Java that will result in 0.

See Int division: Why is the result of 1/3 == 0?

To get 0.05, you need to make a division with double

define an operand as double explicitly
```
5.0 / 100
5 / 100.0
```
cast an operand
```
(double) 5 / 100
5 / (double) 100
```

edited Aug 24 '21 at 16:53

answered Aug 24 '21 at 16:49

azro

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what is Double here?

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