Solved Math...

The below code is giving very long numbers when I input 2, 3, 99 and probably more...

Code:

double temp = 1;
double price = ((temp  * 0.30) + temp) * input;

I do the same math problem in my windows calculator and it turns out not being a super long number, is the java calculator broken?

Heres my full code:

Code:

    } else if (cmd.equals("buy")) {
        if (args.length >= 2) {
            String item = args[1];
            int ammount = 1;
            if (args.length == 3) ammount = Integer.parseInt(args[2]);
           
            double temp = EcoData.getPrice(item);
            double price = ((temp  * 0.30) + temp) * ammount;
           
            if (!(EcoData.getMoney(player.getName()) > price)) {
                send(player, "&c&lInsufishent Funds");
                return;
            }
           
            if (price != 0) {
                send(player, "&2&lBought &7&l" + ammount + " " + item + "&2&l for $&7&l" + String.valueOf(price).replace(".0", ""));
                player.setItemInHand(new ItemStack(Material.AIR));
                EcoData.takeMoney(player.getName(), price);
                player.getInventory().addItem(new ItemStack(Material.getMaterial(item), ammount));
               
            } else send(player, "&c&lCan't Buy That Item");
        return;
    }
    }

Any help is awesome

 

@Meatiex

No

Java doesn't round the number like your calculator does

 

@Meatiex Java calculator is not broken. It is your logic that is. What are you trying to do exactly?

 

double price = ((temp * 0.30) + temp) * input;
temp = how much the item sells for
input = how many items you want to buy
* 0.30 = %30

I want to add %30 to how much the item sells for

 

@Meatiex
Cast it to int.

 

Use 'temp * 1.3 * input' instead of messing with brackets. Not sure what the best way to round it is.

 

What you're doing will give you 130% of the item, however you could just use 1.3 * temp * input, since that's essentially what you're doing in the brackets (minus the "input" bit).

To round it to the nearest tens, use:

Code:

BigDecimal bd = new BigDecimal(price).setScale(2, RoundingMode.HALF_EVEN);

Then use BigDecimal#doubleValue().

 

Awesome, Thanks

Code:

double price = Double.parseDouble(new BigDecimal(EcoData.getPrice(item) * 1.3 * input).setScale(2, RoundingMode.HALF_EVEN).toString());

 

Eh, I'd use:

Code:

double price = new BigDecimal(EcoData.getPrice(item) * 1.3 * input).setScale(2, RoundingMode.HALF_EVEN).doubleValue();

 

will do, Thank you