声明 double 类型变量时格式化它

发布于 2025-01-18 13:17:15 字数 510 浏览 3 评论 0原文

我知道将双重变量格式化为十进制位置的x＃的多种方法。话虽如此：

static double currentSelectedPrice = 0.00; //format to 2 decimal places
static double usercashBalance = 0.00

以下代码通过我的代码在不同的位置找到。我不想浏览代码并格式化（CurrentSelectedPrice -userCashbalance）的结果，

if(usercashBalance < currentSelectedPrice)                
{
      System.out.println("Remaing: $" + (currentSelectedPrice - usercashBalance));
      continue;
}

在声明它们时已经格式化了这些变量是理想的选择（因此，其操作的输出也已格式化）。有可能吗？

原文

I'm aware of the many ways of formatting a double variable to X # of decimal places. With that being said:

static double currentSelectedPrice = 0.00; //format to 2 decimal places
static double usercashBalance = 0.00

The code below is found at different locations through my code. I do not want to go through the code and format the result of (currentSelectedPrice - usercashBalance)

if(usercashBalance < currentSelectedPrice)                
{
      System.out.println("Remaing: quot; + (currentSelectedPrice - usercashBalance));
      continue;
}

It would be ideal to already have those variables formatted when declaring them (so the output of its operations is also formatted).
Is that possible?

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向地狱狂奔 2025-01-25 13:17:15

double（或double）没有格式信息！

它只是值的浮点表示。

这两条线导致d的相同值：

double d = 1;
double d = 1.00000000;

但是，您可以控制双重渲染/格式的方式，例如，

String formatted = String.format("%,.4f", d);

用4个小数位置呈现双重值。

提示：如果将所有货币价值存储为int美分的，并将其呈现为十进制美元，那么您的大多数问题都会消失。

A double (or Double) has no formatting information!

It is just a floating point representation of a value.

These two lines result in identical values for d:

double d = 1;
double d = 1.00000000;

You can however control how a double is rendered/formatted, eg

String formatted = String.format("%,.4f", d);

Renders the double value with 4 decimal places.

Tip: if you store all currency values as an int of cents, and render it as decimal dollars, most of your problems disappear.

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无声静候 2025-01-25 13:17:15

我会尝试这样的东西

if(usercashBalance < currentSelectedPrice)                
{
    System.out.printf("Remaing: $%.<x>f", (currentSelectedPrice - usercashBalance));
    continue;
}

x，指示您要从结果打印的小数数量

I would try something like this

if(usercashBalance < currentSelectedPrice)                
{
    System.out.printf("Remaing: $%.<x>f", (currentSelectedPrice - usercashBalance));
    continue;
}

x indicating the number of decimals you want to print from your result

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