学用 ASP.Net 之 System.Math 类
16lz
2021-04-30
学用 ASP.Net 之 System.Math 类
成员:
/* 字段 */Math.E; //2.71828182845905Math.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 = int64Math.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);}posted on 2011-01-03 14:58 万一 阅读(1540) 评论(2) 编辑 收藏©著作权归作者所有：来自51CTO博客作者JLee79的原创作品，如需转载，请注明出处，否则将追究法律责任
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