how to convert float to decimal in swift

huangapple
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英文:

how to convert float to decimal in swift

问题

在Swift中，您可以如何将浮点值转换为十进制值，然后再添加两个变量？我遇到了一个错误：error: no exact matches in call to initializer。以下是代码示例：

  1. let decimalValue: Decimal = 2.0
  2. let floatValue: Float = 12.00
  3. let sum = Decimal(floatValue) + decimalValue /// error: no exact matches in call to initializer
  5. print(sum)

请注意，这段代码中的错误是由于Decimal的初始化方法没有与Float类型的参数匹配。要解决这个问题，您可以使用NSDecimalNumber类来进行转换和计算。以下是修改后的代码示例：

  1. let decimalValue: Decimal = 2.0
  2. let floatValue: Float = 12.00
  4. let decimalNumber = NSDecimalNumber(value: floatValue)
  5. let sum = decimalNumber.decimalValue + decimalValue
  7. print(sum)

这样，您就可以将Float值转换为Decimal值，并成功进行加法运算。

英文:

In swift, how can I convert float value to decimal value and then add 2 variable? I have
error: no exact matches in call to initializer

  1. let decimalValue: Decimal = 2.0
  2. let floatValue: Float = 12.00
  3. let sum = Decimal(floatValue) + decimalValue /// error: no exact matches in call to initializer
  5. print(sum)

答案1

得分: 4

文档显示没有接受Float类型的初始化器。只有init(_ value: Double)和init(floatLiteral value: Double)两个选项。

你有两个合理的选择：

  1. 将floatValue隐式声明为Double

    1.  let decimalValue: Decimal = 2.0
    2.  let floatValue = 12.00 // <- 推断为Double类型
    3.  let sum = Decimal(floatValue) + decimalValue

  2. 调用init(_ value: Double)

    1.  let decimalValue: Decimal = 2.0
    2.  let floatValue : Float = 12.00
    3.  let sum = Decimal(Double(floatValue)) + decimalValue
英文:

The documentation reveals that there is no initializer which accepts a Float. There are only init(_ value: Double) and init(floatLiteral value: Double)

You have two reasonable options:

  1. Declare floatValue implicit as Double

    1. let decimalValue: Decimal = 2.0
    2. let floatValue = 12.00 // &lt;- inferred as Double
    3. let sum = Decimal(floatValue) + decimalValue

  2. Call init(_ value: Double)

    1. let decimalValue: Decimal = 2.0
    2. let floatValue : Float = 12.00
    3. let sum = Decimal(Double(floatValue)) + decimalValue

huangapple
  • 本文由 发表于 2023年8月8日 21:28:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/76860034.html
  • swift
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