学用 ASP.Net 之 System.Math 类分享


成员:

/* 字段 */ 
Math.E;         //2.71828182845905 
Math.PI;         //3.14159265358979 
 
/* 静态方法 */ 
Math.Abs;       //绝对值 
Math.Acos;       //反余弦 
Math.Asin;       //反正弦 
Math.Atan;       //反正切 
Math.Atan2;      //反正切, 两参数 
Math.BigMul;      //int32 * int32 = int64 
Math.Ceiling;    //取 >= 的最小整数 
Math.Cos;       //余弦 
Math.Cosh;       //双曲余弦 
Math.DivRem;      //取商和余数 
Math.Exp;       //求 e 的指定次幂 
Math.Floor;      //取 <= 的最大整数 
Math.IEEERemainder; //求余 
Math.Log;       //自然对数 
Math.Log10;      //以 10 为底的对数 
Math.Max;       //取大 
Math.Min;       //取小 
Math.Pow;       //求幂 
Math.Round;      //就近舍入, 可指定精度 
Math.Sign;       //取符号, 或返回 -1、0、1 
Math.Sin;       //正弦 
Math.Sinh;       //双曲正弦 
Math.Sqrt;       //平方根 
Math.Tan;       //正切 
Math.Tanh;       //双曲正切 
Math.Truncate;    //取整 

  练习:

//Truncate()、Floor()、Ceiling() 
protected void Button1_Click(object sender, EventArgs e) 
{ 
   double n1 = Math.Truncate(Math.PI); // 3 
 
   double n2 = Math.Floor(2.5);      // 2 
   double n3 = Math.Floor(-2.5);    //-3 
 
   double n4 = Math.Ceiling(2.5);    // 3 
   double n5 = Math.Ceiling(-2.5);   //-2 
 
   TextBox1.Text = string.Concat(n1, ”n”, n2, ”n”, n3, ”n”, n4, ”n”, n5); 
} 
 
//就近舍入(取偶) 
protected void Button2_Click(object sender, EventArgs e) 
{ 
   double n1 = Math.Round(0.5); // 0 
   double n2 = Math.Round(1.5); // 2 
   double n3 = Math.Round(2.5); // 2 
   double n4 = Math.Round(3.5); // 4 
   double n5 = Math.Round(-0.5); // 0 
   double n6 = Math.Round(-1.5); //-2 
   double n7 = Math.Round(-2.5); //-2 
   double n8 = Math.Round(-3.5); //-4 
 
   TextBox1.Text = string.Concat(n1, ”n”, n2, ”n”, n3, ”n”, n4, ”n”, n5, ”n”, n6, ”n”, n7, ”n”, n8); 
} 
 
//四舍五入 
protected void Button3_Click(object sender, EventArgs e) 
{ 
   double n1 = Math.Round(0.5, MidpointRounding.AwayFromZero); // 1 
   double n2 = Math.Round(1.5, MidpointRounding.AwayFromZero); // 2 
   double n3 = Math.Round(2.5, MidpointRounding.AwayFromZero); // 3 
   double n4 = Math.Round(3.5, MidpointRounding.AwayFromZero); // 4 
   double n5 = Math.Round(-0.5, MidpointRounding.AwayFromZero); //-1 
   double n6 = Math.Round(-1.5, MidpointRounding.AwayFromZero); //-2 
   double n7 = Math.Round(-2.5, MidpointRounding.AwayFromZero); //-3 
   double n8 = Math.Round(-3.5, MidpointRounding.AwayFromZero); //-4 
 
   TextBox1.Text = string.Concat(n1, ”n”, n2, ”n”, n3, ”n”, n4, ”n”, n5, ”n”, n6, ”n”, n7, ”n”, n8); 
} 
 
//指定小数位数(0..28)的舍入 
protected void Button4_Click(object sender, EventArgs e) 
{ 
   double n1 = Math.Round(3.126, 2); // 3.13 
   double n2 = Math.Round(3.124, 2); // 3.12 
 
   double n3 = Math.Round(3.125, 2); // 3.12 
   double n4 = Math.Round(3.135, 2); // 3.14 
 
   double n5 = Math.Round(3.125, 2, MidpointRounding.AwayFromZero); // 3.13 
   double n6 = Math.Round(3.135, 2, MidpointRounding.AwayFromZero); // 3.14 
 
   TextBox1.Text = string.Concat(n1, ”n”, n2, ”n”, n3, ”n”, n4, ”n”, n5, ”n”, n6); 
} 

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