【ASP.NET】中 system.math 函数使用

  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
巴特西

【ASP.NET】中 system.math 函数使用

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巴特西

【ASP.NET】 中 system.math 函数使用

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【ASP.NET】中 system.math 函数使用
