Drawing a double and showing the decimal places?

public class ExperienceTable
{
    public static int MaxExperiencePoints;
    public static double PercentToNextLevel;

    public static void checkLevel(Hero player)
    {
        if (player.ExperiencePoints >= 0)
        {
            player.Level = 1;
            MaxExperiencePoints = 15;
            PercentToNextLevel = player.ExperiencePoints / MaxExperiencePoints;
        }
    }

Then drawing it to the screen using:

        GameRef.SpriteBatch.DrawString(GUIFont, "" + ExperienceTable.PercentToNextLevel, new Vector2((int)player.Camera.P开发者_如何学Goosition.X + 1200, (int)player.Camera.Position.Y + 676), Color.White);

How come decimal places don't show up? Seems like the numbers are being rounded.

By default, the decimal place will not be shown if the double is already a rounded number in the first place. I'm guessing player.ExperiencePoints is an int. And int divided by another int will always result to an int, resulting in a rounded value.

Assuming that player.ExperiencePoints is really an int, and you want to have the fraction when dividing it, you should change the division line to the following:

PercentToNextLevel = (double) player.ExperiencePoints / MaxExperiencePoints;

And if you want to have the decimal places displayed eventhough it's .00, then change the ExperienceTable.PercentToNextLevel to something like the following.

ExperienceTable.PercentToNextLevel.ToString("0.00")

.ToString("0.00") will convert the double value to a string with 2 decimal places, and will round it to two decimal places if it have to.

I think

PercentToNextLevel = player.ExperiencePoints / MaxExperiencePoints;

is an integer division (that's if player.ExperiencePoints is an integer).

Try that:

PercentToNextLevel = (double)player.ExperiencePoints / MaxExperiencePoints;

If player.ExperiencePoints is also an int, then you are dividing an integer by an integer, and the result is a rounded integer. Instead, use

PercentToNextLevel = (double)player.ExperiencePoints / MaxExperiencePoints