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发布时间:2017/9/6  浏览次数:2次  字体【    】
 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 }
 
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