1 /* 字段 */
2 Math.E; //2.71828182845905
3 Math.PI; //3.14159265358979
4
5 /* 静态方法 */
6 Math.Abs; //绝对值
7 Math.Acos; //反余弦
8 Math.Asin; //反正弦
9 Math.Atan; //反正切
10 Math.Atan2; //反正切, 两参数
11 Math.BigMul; //int32 * int32 = int64
12 Math.Ceiling; //取 >= 的最小整数
13 Math.Cos; //余弦
14 Math.Cosh; //双曲余弦
15 Math.DivRem; //取商和余数
16 Math.Exp; //求 e 的指定次幂
17 Math.Floor; //取 <= 的最大整数
18 Math.IEEERemainder; //求余
19 Math.Log; //自然对数
20 Math.Log10; //以 10 为底的对数
21 Math.Max; //取大
22 Math.Min; //取小
23 Math.Pow; //求幂
24 Math.Round; //就近舍入, 可指定精度
25 Math.Sign; //取符号, 或返回 -1、0、1
26 Math.Sin; //正弦
27 Math.Sinh; //双曲正弦
28 Math.Sqrt; //平方根
29 Math.Tan; //正切
30 Math.Tanh; //双曲正切
31 Math.Truncate; //取整
32
33
34
35
36 练习:
37 --------------------------------------------------------------------------------
38
39 //Truncate()、Floor()、Ceiling()
40 protected void Button1_Click(object sender, EventArgs e)
41 {
42 double n1 = Math.Truncate(Math.PI); // 3
43
44 double n2 = Math.Floor(2.5); // 2
45 double n3 = Math.Floor(-2.5); //-3
46
47 double n4 = Math.Ceiling(2.5); // 3
48 double n5 = Math.Ceiling(-2.5); //-2
49
50 TextBox1.Text = string.Concat(n1, "\n", n2, "\n", n3, "\n", n4, "\n", n5);
51 }
52
53 //就近舍入(取偶)
54 protected void Button2_Click(object sender, EventArgs e)
55 {
56 double n1 = Math.Round(0.5); // 0
57 double n2 = Math.Round(1.5); // 2
58 double n3 = Math.Round(2.5); // 2
59 double n4 = Math.Round(3.5); // 4
60 double n5 = Math.Round(-0.5); // 0
61 double n6 = Math.Round(-1.5); //-2
62 double n7 = Math.Round(-2.5); //-2
63 double n8 = Math.Round(-3.5); //-4
64
65 TextBox1.Text = string.Concat(n1, "\n", n2, "\n", n3, "\n", n4, "\n", n5, "\n", n6, "\n", n7, "\n", n8);
66 }
67
68 //四舍五入
69 protected void Button3_Click(object sender, EventArgs e)
70 {
71 double n1 = Math.Round(0.5, MidpointRounding.AwayFromZero); // 1
72 double n2 = Math.Round(1.5, MidpointRounding.AwayFromZero); // 2
73 double n3 = Math.Round(2.5, MidpointRounding.AwayFromZero); // 3
74 double n4 = Math.Round(3.5, MidpointRounding.AwayFromZero); // 4
75 double n5 = Math.Round(-0.5, MidpointRounding.AwayFromZero); //-1
76 double n6 = Math.Round(-1.5, MidpointRounding.AwayFromZero); //-2
77 double n7 = Math.Round(-2.5, MidpointRounding.AwayFromZero); //-3
78 double n8 = Math.Round(-3.5, MidpointRounding.AwayFromZero); //-4
79
80 TextBox1.Text = string.Concat(n1, "\n", n2, "\n", n3, "\n", n4, "\n", n5, "\n", n6, "\n", n7, "\n", n8);
81 }
82
83 //指定小数位数(0..28)的舍入
84 protected void Button4_Click(object sender, EventArgs e)
85 {
86 double n1 = Math.Round(3.126, 2); // 3.13
87 double n2 = Math.Round(3.124, 2); // 3.12
88
89 double n3 = Math.Round(3.125, 2); // 3.12
90 double n4 = Math.Round(3.135, 2); // 3.14
91
92 double n5 = Math.Round(3.125, 2, MidpointRounding.AwayFromZero); // 3.13
93 double n6 = Math.Round(3.135, 2, MidpointRounding.AwayFromZero); // 3.14
94
95 TextBox1.Text = string.Concat(n1, "\n", n2, "\n", n3, "\n", n4, "\n", n5, "\n", n6);
96 }
97
98
99
100 asp.net 系统中math数学函数 能够很快的帮我们进行运算！
转：http://www.cnblogs.com/ruicky/archive/2012/06/19/2554821.html
