Math.IEEERemainder(Double, Double) Math.IEEERemainder(Double, Double) Math.IEEERemainder(Double, Double) Math.IEEERemainder(Double, Double) Method

定义

返回一指定数字被另一指定数字相除的余数。Returns the remainder resulting from the division of a specified number by another specified number.

public:
 static double IEEERemainder(double x, double y);
public static double IEEERemainder (double x, double y);
static member IEEERemainder : double * double -> double
Public Shared Function IEEERemainder (x As Double, y As Double) As Double

参数

x
Double Double Double Double

被除数。A dividend.

y
Double Double Double Double

除数。A divisor.

返回

等于 x - (y Q) 的数,其中 Q 是 x / y 的商的最接近整数(如果 x / y 在两个整数中间,则返回偶数)。A number equal to x - (y Q), where Q is the quotient of x / y rounded to the nearest integer (if x / y falls halfway between two integers, the even integer is returned).

如果 x - (y Q) 为零,则在 x 为正时返回值 +0,而在 x 为负时返回 -0。If x - (y Q) is zero, the value +0 is returned if x is positive, or -0 if x is negative.

如果 y = 0,则返回 NaNIf y = 0, NaN is returned.

示例

下面的示例将IEEERemainder方法返回的余数与余数运算符返回的余数进行比较。The following example contrasts the remainder returned by the IEEERemainder method with the remainder returned by the remainder operator.

using System;

public class Example
{
   public static void Main()
   {
      Console.WriteLine($"{"IEEERemainder",35} {"Remainder operator",20}");
      ShowRemainders(3, 2);
      ShowRemainders(4, 2);
      ShowRemainders(10, 3);
      ShowRemainders(11, 3);
      ShowRemainders(27, 4);
      ShowRemainders(28, 5);
      ShowRemainders(17.8, 4);
      ShowRemainders(17.8, 4.1);
      ShowRemainders(-16.3, 4.1);
      ShowRemainders(17.8, -4.1);
      ShowRemainders(-17.8, -4.1);
   }

   private static void ShowRemainders(double number1, double number2)
   {
      var formula = $"{number1} / {number2} = ";
      var ieeeRemainder = Math.IEEERemainder(number1, number2);
      var remainder = number1 % number2;
      Console.WriteLine($"{formula,-16} {ieeeRemainder,18} {remainder,20}");
   }
}
// The example displays the following output:
//       
//
//                       IEEERemainder   Remainder operator
// 3 / 2 =                          -1                    1
// 4 / 2 =                           0                    0
// 10 / 3 =                          1                    1
// 11 / 3 =                         -1                    2
// 27 / 4 =                         -1                    3
// 28 / 5 =                         -2                    3
// 17.8 / 4 =                      1.8                  1.8
// 17.8 / 4.1 =                    1.4                  1.4
// -16.3 / 4.1 =    0.0999999999999979                   -4
// 17.8 / -4.1 =                   1.4                  1.4
// -17.8 / -4.1 =                 -1.4                 -1.4
Module Example
    Public Sub Main()
        Console.WriteLine($"{"IEEERemainder",35} {"Remainder operator",20}")
        ShowRemainders(3, 2)
        ShowRemainders(4, 2)
        ShowRemainders(10, 3)
        ShowRemainders(11, 3)
        ShowRemainders(27, 4)
        ShowRemainders(28, 5)
        ShowRemainders(17.8, 4)
        ShowRemainders(17.8, 4.1)
        ShowRemainders(-16.3, 4.1)
        ShowRemainders(17.8, -4.1)
        ShowRemainders(-17.8, -4.1)
    End Sub

    Private Sub ShowRemainders(number1 As Double, number2 As Double)
        Dim formula As String = $"{number1} / {number2} = "
        Dim ieeeRemainder As Double = Math.IEEERemainder(number1, number2)
        Dim remainder As Double = number1 Mod number2
        Console.WriteLine($"{formula,-16} {ieeeRemainder,18} {remainder,20}")
    End Sub
End Module
' The example displays the following output:
'       
'                       IEEERemainder   Remainder operator
' 3 / 2 =                          -1                    1
' 4 / 2 =                           0                    0
' 10 / 3 =                          1                    1
' 11 / 3 =                         -1                    2
' 27 / 4 =                         -1                    3
' 28 / 5 =                         -2                    3
' 17.8 / 4 =                      1.8                  1.8
' 17.8 / 4.1 =                    1.4                  1.4
' -16.3 / 4.1 =    0.0999999999999979                   -4
' 17.8 / -4.1 =                   1.4                  1.4
' -17.8 / -4.1 =                 -1.4                 -1.4

注解

此操作符合 ANSI/IEEE Std 754-1985 第5.1 节中定义的其余操作。二元浮点算术的 IEEE 标准;电气和电子工程师协会,Inc.;1985。This operation complies with the remainder operation defined in Section 5.1 of ANSI/IEEE Std 754-1985; IEEE Standard for Binary Floating-Point Arithmetic; Institute of Electrical and Electronics Engineers, Inc; 1985.

方法不同于余数运算符。 IEEERemainderThe IEEERemainder method is not the same as the remainder operator. 尽管这两个方法都返回相除后的余数,但它们使用的公式是不同的。Although both return the remainder after division, the formulas they use are different. IEEERemainder方法的公式为:The formula for the IEEERemainder method is:

IEEERemainder = dividend - (divisor * Math.Round(dividend / divisor))  

相反,余数运算符的公式为:In contrast, the formula for the remainder operator is:

Remainder = (Math.Abs(dividend) - (Math.Abs(divisor) *   
            (Math.Floor(Math.Abs(dividend) / Math.Abs(divisor))))) *   
            Math.Sign(dividend)  

适用于