独角兽企业重金招聘Python工程师标准>>>
1.函数实现
0）打印数组
/// <summary>/// 打印数组/// </summary>/// <param name="arr">数组</param>/// <param name="numberPerLine">每行打印元素数量</param>/// <param name="digitAfterDot">小数点后保留位数</param>private static void PrintArray(double[] arr, int numberPerLine = 7, int digitAfterDot = 2){//设定小数点后保留位数（函数ToString()的参数）string format = "#0.";while (true){if (digitAfterDot <= 0) break;format += '0';digitAfterDot--;}//打印数组for (int i = 0; i < (arr.Length - 1) / numberPerLine + 1; i++){for (int j = 0; j < numberPerLine; j++){int index = i * numberPerLine + j;if (index < arr.Length){Console.Write(arr[index].ToString(format) + "\t");}}Console.WriteLine();}}
1）算术平均数：（x1+x2+...+xn）/n
/// <summary>/// 计算算数平均数:（x1+x2+...+xn）/n/// </summary>/// <param name="arr">数组</param>/// <returns>算术平均数</returns>private static double ArithmeticMean(double[] arr){double result = 0;foreach (double num in arr){result += num;}return result / arr.Length;}
2）几何平均数：(x1*x2*...*xn)^(1/n)
/// <summary>/// 几何平均数：(x1*x2*...*xn)^(1/n)/// </summary>/// <param name="arr">数组</param>/// <returns>几何平均数</returns>private static double GeometricMean(double[] arr){double result = 1;foreach (double num in arr){result *= Math.Pow(num, 1.0 / arr.Length);}return result;}
3）调和平均数：n/((1/x1)+(1/x2)+...+(1/xn))
/// <summary>/// 调和平均数：n/((1/x1)+(1/x2)+...+(1/xn))/// </summary>/// <param name="arr">数组</param>/// <returns>调和平均数</returns>private static double HarmonicMean(double[] arr){double temp = 0;foreach (double num in arr){temp += (1.0 / num);}return arr.Length / temp;}
4）平方平均数：((x1*x1+x2*x2+...+xn*xn)/n)^(1/2)
/// <summary>/// 平方平均数：((x1*x1+x2*x2+...+xn*xn)/n)^(1/2)/// </summary>/// <param name="arr">数组</param>/// <returns>平方平均数</returns>private static double RootMeanSquare(double[] arr){double temp = 0;foreach (double num in arr){temp += (num * num);}return Math.Sqrt(temp / arr.Length);}
5）中位数
/// <summary>/// 计算中位数/// </summary>/// <param name="arr">数组</param>/// <returns></returns>private static double Median(double[] arr){//为了不修改arr值，对数组的计算和修改在tempArr数组中进行double[] tempArr = new double[arr.Length];arr.CopyTo(tempArr, 0);//对数组进行排序double temp;for (int i = 0; i < tempArr.Length; i++){for (int j = i; j < tempArr.Length; j++){if (tempArr[i] > tempArr[j]){temp = tempArr[i];tempArr[i] = tempArr[j];tempArr[j] = temp;}}}//针对数组元素的奇偶分类讨论if (tempArr.Length % 2 != 0){return tempArr[arr.Length / 2 + 1];}else{return (tempArr[tempArr.Length / 2] +tempArr[tempArr.Length / 2 + 1]) / 2.0;}}
2.Main函数调用
static void Main(string[] args){//一个数组double[] arr = new double[] {3, 2, 7, 4, 8, 8, 5,5, 6, 5, 1, 8, 4, 9};//打印数组PrintArray(arr);//调和平均数≤几何平均数≤算术平均数≤平方平均数Console.WriteLine("算术平均数：" + ArithmeticMean(arr).ToString("#0.000"));Console.WriteLine("几何平均数：" + GeometricMean(arr).ToString("#0.000"));Console.WriteLine("调和平均数：" + HarmonicMean(arr).ToString("#0.000"));Console.WriteLine("平方平均数：" + RootMeanSquare(arr).ToString("#0.000"));Console.WriteLine("中位数：" + Median(arr).ToString("#0.000"));Console.ReadLine();}
3.运行示例
