C＃中的MathF.Round()方法，包含示例|套装– 1

在C＃中， MathF.Round()是MathF类方法，用于将值四舍五入到最接近的整数或小数位数。可以通过更改传递的参数的数量和类型来重载此方法。 MathF.Round()方法的重载列表中有4种方法。

1. MathF.Round(Single)方法
2. MathF.Round(Single，Int32)方法
3. MathF.Round(Single，Int32，MidpointRounding)方法
4. MathF.Round(Single，MidpointRounding)方法

在这里，我们将讨论前两种方法。

MathF.Round(Single)方法

此方法将单精度浮点值舍入为最接近的整数值。

Syntax: public static float Round (float x);
Here, x is a singlefloating-point number which is to be rounded. Type of this parameter is System.Single.

Return Type:It returns the integer nearest to x and return type is System.Single.

注意：如果x的小数部分位于两个整数的中间，其中一个为偶数，另一个为奇数，则返回偶数。

例子：

// C# program to demonstrate the
// MathF.Round(Single) method
using System;
  
class Geeks {
  
    // Main method
    static void Main(string[] args)
    {
  
        // Case-1
        // A float value whose fractional part is
        // less than the halfway between two
        // consecutive integers
        float dx1 = 12.434565f;
  
        // Output value will be 12
        Console.WriteLine("Rounded value of " + dx1 +
                          " is " + MathF.Round(dx1));
  
        // Case-2
        // A float value whose fractional part is
        // greater than the halfway between two
        // consecutive integers
        float dx2 = 12.634565f;
  
        // Output value will be 13
        Console.WriteLine("Rounded value of " + dx2 +
                          " is " + MathF.Round(dx2));
    }
}

输出：

Rounded value of 12.43456 is 12
Rounded value of 12.63457 is 13

MathF.Round(Single，Int32)方法

此方法将单个精度浮点值舍入为指定数量的小数位数。

Syntax: public static float Round (float x, int digits);

Parameters:
x: A single floating-point number which is to be rounded. Type of this parameter is System.Single.
y: It is the number of fractional digits in the returned value. Type of this parameter is System.Int32.

返回类型：返回最接近x的整数，该整数包含等于y的小数位数，返回类型为System.Single 。

异常：如果y的值小于0或大于15，则此方法将提供ArgumentOutOfRangeException。

例子：

// C# program to demonstrate the
// MathF.Round(Single, Int32) Method
using System;
  
class Geeks {
  
    // Main method
    static void Main(string[] args)
    {
  
        // float type
        float dx1 = 12.434565f;
  
        // using method
        Console.WriteLine("Rounded value of " + dx1 +
                      " is " + MathF.Round(dx1, 4));
  
        // float type
        float dx2 = 12.634565f;
  
        // using method
        Console.WriteLine("Rounded value of " + dx2 +
                       " is " + MathF.Round(dx2, 2));
    }
}

输出：

Rounded value of 12.43456 is 12.4346
Rounded value of 12.63457 is 12.63