试试这个。

Math.Floor() vs Math.Truncate()

Math.Floor(2.56) = 2
Math.Floor(3.22) = 3
Math.Floor(-2.56) = -3
Math.Floor(-3.26) = -4

Math.Truncate(2.56) = 2
Math.Truncate(2.00) = 2
Math.Truncate(1.20) = 1
Math.Truncate(-3.26) = -3
Math.Truncate(-3.96) = -3

还Math.Round ()

   Math.Round(1.6) = 2
   Math.Round(-8.56) = -9
   Math.Round(8.16) = 8
   Math.Round(8.50) = 8
   Math.Round(8.51) = 9

math.floor ()

返回小于或等于指定数字的最大整数。 MSDN system.math.floor

math.truncate ()

计算一个数的积分部分。 MSDN system.math.truncate

试试这个。

Math.Floor() vs Math.Truncate()

Math.Floor(2.56) = 2
Math.Floor(3.22) = 3
Math.Floor(-2.56) = -3
Math.Floor(-3.26) = -4

Math.Truncate(2.56) = 2
Math.Truncate(2.00) = 2
Math.Truncate(1.20) = 1
Math.Truncate(-3.26) = -3
Math.Truncate(-3.96) = -3

还Math.Round ()

   Math.Round(1.6) = 2
   Math.Round(-8.56) = -9
   Math.Round(8.16) = 8
   Math.Round(8.50) = 8
   Math.Round(8.51) = 9

math.floor ()

返回小于或等于指定数字的最大整数。 MSDN system.math.floor

math.truncate ()

计算一个数的积分部分。 MSDN system.math.truncate

以下是MSDN对以下内容的描述:

Math.Floor, which rounds down towards negative infinity. Math.Ceiling, which rounds up towards positive infinity. Math.Truncate, which rounds up or down towards zero. Math.Round, which rounds to the nearest integer or specified number of decimal places. You can specify the behavior if it's exactly equidistant between two possibilities, such as rounding so that the final digit is even ("Round(2.5,MidpointRounding.ToEven)" becoming 2) or so that it's further away from zero ("Round(2.5,MidpointRounding.AwayFromZero)" becoming 3).

下面的图表可能会有所帮助:

-3        -2        -1         0         1         2         3
 +--|------+---------+----|----+--|------+----|----+-------|-+
    a                     b       c           d            e

                       a=-2.7  b=-0.5  c=0.3  d=1.5  e=2.8
                       ======  ======  =====  =====  =====
Floor                    -3      -1      0      1      2
Ceiling                  -2       0      1      2      3
Truncate                 -2       0      0      1      2
Round (ToEven)           -3       0      0      2      3
Round (AwayFromZero)     -3      -1      0      2      3

请注意，Round比它看起来强大得多，因为它可以舍入到特定的小数点后数位。其他的都是0小数。例如:

n = 3.145;
a = System.Math.Round (n, 2, MidpointRounding.ToEven);       // 3.14
b = System.Math.Round (n, 2, MidpointRounding.AwayFromZero); // 3.15

对于其他函数，你必须使用乘除技巧来达到相同的效果:

c = System.Math.Truncate (n * 100) / 100;                    // 3.14
d = System.Math.Ceiling (n * 100) / 100;                     // 3.15

一些例子:

Round(1.5) = 2
Round(2.5) = 2
Round(1.5, MidpointRounding.AwayFromZero) = 2
Round(2.5, MidpointRounding.AwayFromZero) = 3
Round(1.55, 1) = 1.6
Round(1.65, 1) = 1.6
Round(1.55, 1, MidpointRounding.AwayFromZero) = 1.6
Round(1.65, 1, MidpointRounding.AwayFromZero) = 1.7

Truncate(2.10) = 2
Truncate(2.00) = 2
Truncate(1.90) = 1
Truncate(1.80) = 1

Math.Floor()轮 "朝向负无穷"符合IEEE标准754第4节。

Math.Truncate()舍入“最接近零的整数”。

Math.floor()将始终向下舍入。，返回LESSER整数。While round()将返回NEAREST整数

math.floor ()

返回小于或等于指定数字的最大整数。

math.truncate ()

计算一个数的积分部分。