C# 画双精度并显示小数点？

然后使用以下命令将其绘制到屏幕：

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;
        }
    }

---

为什么小数点不出现？看起来这些数字正在四舍五入。

默认情况下，如果第一位的double已经是四舍五入的数字，则不会显示小数点。我猜是

玩家。ExperiencePoints

是一个

int

。而

int

除以另一个

int

将始终得到

int

，从而得到一个四舍五入的值

假设

player.ExperiencePoints

实际上是一个

int

，并且您希望在分割它时得到分数，您应该将分割线更改为以下内容：

        GameRef.SpriteBatch.DrawString(GUIFont, "" + ExperienceTable.PercentToNextLevel, new Vector2((int)player.Camera.Position.X + 1200, (int)player.Camera.Position.Y + 676), Color.White);

如果希望在

.00

时显示小数点，则将

ExperienceTable.PercentToNextLevel

更改为如下内容

PercentToNextLevel = (double) player.ExperiencePoints / MaxExperiencePoints;

.ToString（“0.00”）

会将双精度值转换为小数点后两位的字符串，如果有必要，会将其四舍五入到小数点后两位。

我认为

ExperienceTable.PercentToNextLevel.ToString("0.00")

是整数除法（如果

player.ExperiencePoints

是整数）

试试看：

PercentToNextLevel = player.ExperiencePoints / MaxExperiencePoints;

---

如果

player.ExperiencePoints

也是一个

int

，则您将整数除以整数，结果是一个四舍五入整数。相反，使用

PercentToNextLevel = (double)player.ExperiencePoints / MaxExperiencePoints;

PercentToNextLevel = (double)player.ExperiencePoints / MaxExperiencePoints