Solved Calculation giving wrong answer

Heey guys,

I am back at it again with a really small problem. I am getting a percentage of a progress from a money balance. So I made a calculation where it should give us the percentage of the money that the player has compared to the money that the player needs to do stuff. But the answer of this calculation is 0.0 for some reason. I checked the calculation in a calculator and the answer was right, but not in the plugin.
Please help me!

Code:

Code:

DecimalFormat format = new DecimalFormat("#.0");
double calculation = 100 / getConfig().getInt("prison-ranks." + rank) * moneyConfig.getInt(players.getUniqueId().toString());
String percentage = format.format(calculation).replace(",", ".");

 

For example, the player has 67$. He needs 225$.

1. Calculate the percentage: playermoney / neededmoney, which gives 0,2977777777777778 in this example
2. Multiply it by 100 and then apply the decimalformat and you have: 29.8%

System.out.println the values from the config to make sure you got them right

 

Try replacing 100 with 100.0D in your second line. Otherwise it might cast your calculation result to int before casting it to double, because all the other factors are int as well.

 

@blablubbabc, that's exactly what's happening.

@CheesyFreezy you must typecast the result of your second line, regardless of the type of the variable it is assigned to. Read this. http://mathbits.com/MathBits/Java/DataBasics/Mathoperators.htm

When I saw this I was wondering if it was a rounding error. Thank goodness it wasn't, because that would be an ugly fix. I've only seen it happen once in my years of programming.