Merge pull request #291 from ikesnowy/Dev-2.1

2.1 Completed

1 Fundamental/1.1/1.1.10/Program.cs

@@ -13,7 +13,12 @@ static void Main(string[] args)
             int[] a;
             for (int i = 0; i < 10; i++)
             {
-                a[i] = i * i; // 不允许使用未赋值的局部变量
+                // a[i] = i * i; // 不允许使用未赋值的局部变量
+            }
+            a = new int[10];
+            for (int i = 0; i < 10; i++)
+            {
+                 a[i] = i * i; // 初始化后可用
             }
         }
     }

1 Fundamental/1.1/1.1.14/Program.cs

@@ -24,7 +24,7 @@ static int lg(int N)
             int pow = 1;
             int sum = 2;
 
-            for (pow = 1; sum < N; ++pow)
+            for (pow = 1; sum < N; pow++)
             {
                 sum *= baseNumber;
             }

1 Fundamental/1.1/1.1.15/Program.cs

@@ -19,7 +19,7 @@ static void Main(string[] args)
         {
             int[] a = new int[10];
             int M = 10;
-            for (int i = 0; i < 10; ++i)
+            for (int i = 0; i < 10; i++)
             {
                 a[i] = i;
             }
@@ -34,13 +34,13 @@ static int[] Histogram(int[] a, int M)
         {
             int[] result = new int[M];
 
-            for (int i = 0; i < M; ++i)
+            for (int i = 0; i < M; i++)
             {
                 // 初始化
                 result[i] = 0;
 
                 // 遍历数组，计算数组中值为 i 的元素个数
-                for (int j = 0; j < a.Length; ++j)
+                for (int j = 0; j < a.Length; j++)
                 {
                     if (a[j] == i) // 值为 i 的元素
                     {

1 Fundamental/1.1/1.1.19/Fibnacci.cs

@@ -41,7 +41,7 @@ static void Main(string[] args)
              * 
              */
             Stopwatch timer = Stopwatch.StartNew();
-            for (int N = 0; N < 100; ++N)
+            for (int N = 0; N < 100; N++)
             {
                 // 书本中的代码，非常慢，1小时后 N = 50
                 // Console.WriteLine($"{N} {F(N)}");

1 Fundamental/1.1/1.1.21/Program.cs

@@ -32,11 +32,11 @@ static void Main(string[] args)
             int[,] array = new int[rows, columns];      // 输入的两个整数
             double[] results = new double[rows];        // 计算结果
 
-            for (int i = 0; i < rows; ++i)
+            for (int i = 0; i < rows; i++)
             {
                 string temp = Console.ReadLine();
                 names[i] = temp.Split(' ')[0];
-                for (int j = 0; j < columns; ++j)
+                for (int j = 0; j < columns; j++)
                 {
                     array[i, j] = int.Parse(temp.Split(' ')[j + 1]);
                 }

1 Fundamental/1.1/1.1.22/BinarySearch.cs

@@ -42,7 +42,7 @@ public static int rank(int key, int[] a)
         public  static int rank(int key, int[] a, int lo, int hi, int number)
         {
 
-            for (int i = 0; i < number; ++i)
+            for (int i = 0; i < number; i++)
             {
                 Console.Write(" ");
             }

1 Fundamental/1.1/1.1.23/Program.cs

@@ -18,7 +18,7 @@ static void Main(string[] args)
             string[] whiteList = File.ReadAllLines("largeW.txt");
             int[] WhiteList = new int[whiteList.Length];
 
-            for (int i = 0; i < whiteList.Length; ++i)
+            for (int i = 0; i < whiteList.Length; i++)
             {
                 WhiteList[i] = int.Parse(whiteList[i]);
             }
@@ -29,7 +29,7 @@ static void Main(string[] args)
             // 输入样例：5 824524 478510 387221
             string input = Console.ReadLine();
             int[] Query = new int[input.Split(' ').Length];
-            for (int i = 0; i < Query.Length; ++i)
+            for (int i = 0; i < Query.Length; i++)
             {
                 Query[i] = int.Parse(input.Split(' ')[i]);
             }

1 Fundamental/1.1/1.1.28/BinarySearch.cs

@@ -22,7 +22,7 @@ static void Main(string[] args)
             h.CopyTo(whiteList);
             int[] WhiteList = new int[whiteList.Length];
 
-            for (int i = 0; i < whiteList.Length; ++i)
+            for (int i = 0; i < whiteList.Length; i++)
             {
                 WhiteList[i] = int.Parse(whiteList[i]);
             }
@@ -33,7 +33,7 @@ static void Main(string[] args)
             // 输入样例：5 824524 478510 387221
             string input = Console.ReadLine();
             int[] Query = new int[input.Split(' ').Length];
-            for (int i = 0; i < Query.Length; ++i)
+            for (int i = 0; i < Query.Length; i++)
             {
                 Query[i] = int.Parse(input.Split(' ')[i]);
             }

1 Fundamental/1.1/1.1.29/BinarySearch.cs

@@ -26,7 +26,7 @@ static void Main(string[] args)
             Console.WriteLine("Type the numbers you want to query: ");
             string input = Console.ReadLine();
             int[] Query = new int[input.Split(' ').Length];
-            for (int i = 0; i < Query.Length; ++i)
+            for (int i = 0; i < Query.Length; i++)
             {
                 Query[i] = int.Parse(input.Split(' ')[i]);
             }

1 Fundamental/1.1/1.1.30/Program.cs

@@ -19,9 +19,9 @@ static void Main(string[] args)
 
             bool[,] a = new bool[N, N];
 
-            for (int i = 0; i < N; ++i)
+            for (int i = 0; i < N; i++)
             {
-                for (int j = 0; j < N; ++j)
+                for (int j = 0; j < N; j++)
                 {
                     a[i, j] = (gcd(i, j) == 1);
                 }

1 Fundamental/1.1/1.1.31/Program.cs

@@ -59,7 +59,7 @@ public static void StartDrawing(int N, double p)
             points[0].X = rect.Left + rect.Width / 2;
             points[0].Y = rect.Top;
 
-            for (int i = 1; i < N; ++i)
+            for (int i = 1; i < N; i++)
             {
                 points[i] = Rotate(Center, points[i - 1], rotateDgree);
             }
@@ -72,9 +72,9 @@ public static void StartDrawing(int N, double p)
 
             // 按照概率绘制直线
             Random random = new Random();
-            for (int i = 0; i < N; ++i)
+            for (int i = 0; i < N; i++)
             {
-                for (int j = i + 1; j < N; ++j)
+                for (int j = i + 1; j < N; j++)
                 {
                     // 举例：输入概率为 0.6，精度为 1000
                     // 在 0~1000 范围内等概率取值，如果小于等于 600 则视为事件发生

1 Fundamental/1.1/1.1.32/Form1.cs

@@ -29,7 +29,7 @@ private void button1_Click(object sender, EventArgs e)
                     //选择文件
                     openfiledialog.OpenFile();
                     //修改路径框显示
-                    InputFilePath.Text = openfiledialog.FileName;
+                    this.InputFilePath.Text = openfiledialog.FileName;
                 }
                 catch (Exception ex)
                 {
@@ -43,34 +43,34 @@ private void button2_Click(object sender, EventArgs e)
             try
             {
                 //打开文件并读取全部数字
-                string[] stringNums = File.ReadAllLines(InputFilePath.Text);
+                string[] stringNums = File.ReadAllLines(this.InputFilePath.Text);
                 //建立 double 数组
                 double[] Numbers = new double[stringNums.Length];
                 //将数字从 string 转换为 double
-                for (int i = 0; i < stringNums.Length; ++i)
+                for (int i = 0; i < stringNums.Length; i++)
                 {
                     Numbers[i] = double.Parse(stringNums[i]);
                 }
 
                 try
                 {
-                    int N = int.Parse(InputN.Text);
+                    int N = int.Parse(this.InputN.Text);
                     if (N <= 0)
                     {
-                        ErrorLabel.Text = "N 必须大于 0";
+                        this.ErrorLabel.Text = "N 必须大于 0";
                         return;
                     }
-                    double L = double.Parse(InputL.Text);
-                    double R = double.Parse(InputR.Text);
+                    double L = double.Parse(this.InputL.Text);
+                    double R = double.Parse(this.InputR.Text);
                     Program.StartDrawing(Numbers, N, L, R);
                 }
                 catch (FormatException fex)
                 {
-                    ErrorLabel.Text = "格式有误（是否漏填了某项？）" + fex.Message;
+                    this.ErrorLabel.Text = "格式有误（是否漏填了某项？）" + fex.Message;
                 }
                 catch (OverflowException oex)
                 {
-                    ErrorLabel.Text = "数据过大（输入的内容太多）" + oex.Message;
+                    this.ErrorLabel.Text = "数据过大（输入的内容太多）" + oex.Message;
                 }
             }
             catch (Exception ex)

1 Fundamental/1.1/1.1.32/Program.cs

@@ -53,9 +53,9 @@ public static void StartDrawing(double[] array, int N, double l, double r)
             // 计算各区域的值
             int[] counts = new int[N];
             int index = 0;
-            for (int i = 0; i < N; ++i)
+            for (int i = 0; i < N; i++)
             {
-                for (int j = index; j < array.Length; ++j)
+                for (int j = index; j < array.Length; j++)
                 {
                     if (array[j] <= (r - l) * (i + 1) / N)
                     {
@@ -79,7 +79,7 @@ public static void StartDrawing(double[] array, int N, double l, double r)
             rects[0].Y = 0;
             rects[0].Width = (int)(2 * unit);
             rects[0].Height = (int)((counts[0] / max) * DrawPad.Height);
-            for (int i = 1; i < N; ++i)
+            for (int i = 1; i < N; i++)
             {
                 rects[i].X = (int)(rects[i - 1].X + 3 * unit);
                 rects[i].Y = 0;

1 Fundamental/1.1/1.1.33/Matrix.cs

@@ -21,7 +21,7 @@ public static double Dot(double[] x, double[] y)
 
             // 点乘
             double result = 0;
-            for (int i = 0; i < x.Length; ++i)
+            for (int i = 0; i < x.Length; i++)
             {
                 result += x[i] * y[i];
             }
@@ -54,16 +54,16 @@ public static double[][] Mult(double[][] a, double[][] b)
 
             double[][] result = new double[m][];
 
-            for (int i = 0; i < m; ++i)
+            for (int i = 0; i < m; i++)
             {
                 double[] resultrow = new double[n];
-                for (int j = 0; j < n; ++j)
+                for (int j = 0; j < n; j++)
                 {
                     // result[i][j] = 行向量 a[i] 与列向量 b[j] 的点积
                     double[] row = a[i];
                     double[] col = new double[p];
                     // 取得列向量
-                    for (int k = 0; k < p; ++k)
+                    for (int k = 0; k < p; k++)
                     {
                         col[k] = b[k][j];
                     }
@@ -83,10 +83,10 @@ public static double[][] Mult(double[][] a, double[][] b)
         public static double[][] Transpose(double[][] a)
         {
             double[][] trans = new double[a[0].Length][];
-            for (int i = 0; i < a[0].Length; ++i)
+            for (int i = 0; i < a[0].Length; i++)
             {
                 double[] row = new double[a.GetLength(0)];
-                for (int j = 0; j < a.GetLength(0); ++j)
+                for (int j = 0; j < a.GetLength(0); j++)
                 {
                     row[j] = a[j][i];
                 }
@@ -111,7 +111,7 @@ public static double[] Mult(double[][] a, double[] x)
 
             double[] result = new double[a.GetLength(0)];
 
-            for (int i = 0; i < a.GetLength(0); ++i)
+            for (int i = 0; i < a.GetLength(0); i++)
             {
                 result[i] = Dot(a[i], x);
             }
@@ -135,10 +135,10 @@ public static double[] Mult(double[] x, double[][] a)
 
             double[] result = new double[a[0].Length];
 
-            for (int i = 0; i < a[0].Length; ++i)
+            for (int i = 0; i < a[0].Length; i++)
             {
                 double[] colVector = new double[a.GetLength(0)];
-                for (int j = 0; j < colVector.Length; ++j)
+                for (int j = 0; j < colVector.Length; j++)
                 {
                     colVector[j] = a[j][i];
                 }
@@ -154,9 +154,9 @@ public static double[] Mult(double[] x, double[][] a)
         /// <param name="a">需要输出的矩阵。</param>
         public static void PrintMatrix(double[][] a)
         {
-            for (int i = 0; i < a.GetLength(0); ++i)
+            for (int i = 0; i < a.GetLength(0); i++)
             {
-                for (int j = 0; j < a[i].Length; ++j)
+                for (int j = 0; j < a[i].Length; j++)
                 {
                     Console.Write($"\t{a[i][j]}");
                 }
@@ -170,7 +170,7 @@ public static void PrintMatrix(double[][] a)
         /// <param name="a">需要输出的向量。</param>
         public static void PrintVector(double[] a)
         {
-            for (int i = 0; i < a.Length; ++i)
+            for (int i = 0; i < a.Length; i++)
             {
                 Console.Write($"\t{a[i]}");
             }

1 Fundamental/1.1/1.1.34/Program.cs

@@ -31,7 +31,7 @@ static void Main(string[] args)
             int N = AllNumbers.Length;
             int[] input = new int[N];
 
-            for (int i = 0; i < N; ++i)
+            for (int i = 0; i < N; i++)
             {
                 input[i] = int.Parse(AllNumbers[i]);
             }
@@ -69,7 +69,7 @@ static void MinAndMax(int[] input)
             int max = input[0];
 
             // 只对输入值正向遍历一遍，不需要保存
-            for (int i = 1; i < input.Length; ++i)
+            for (int i = 1; i < input.Length; i++)
             {
                 if (input[i] > max)
                 {
@@ -113,7 +113,7 @@ static int NumberK(int k, int[] input)
             int[] temp = new int[101];
 
             // 只正向遍历一遍，不需要保存
-            for (int i = 0; i < input.Length; ++i)
+            for (int i = 0; i < input.Length; i++)
             {
                 if (i < 100)
                 {
@@ -141,7 +141,7 @@ static long SquareSum(int[] input)
         {
             long sum = 0;
             // 只正向遍历一遍，不需要保存
-            for (int i = 0; i < input.Length; ++i)
+            for (int i = 0; i < input.Length; i++)
             {
                 sum += input[i] * input[i];
             }
@@ -162,7 +162,7 @@ static double Average(int[] input)
             long sum = 0;
 
             // 只遍历一遍，且不保存整个数组
-            for (int i = 0; i < input.Length; ++i)
+            for (int i = 0; i < input.Length; i++)
             {
                 sum += input[i];
             }
@@ -186,7 +186,7 @@ static double AboveAverage(int[] input)
             Console.WriteLine();
             double count = 0;
 
-            for (int i = 0; i < input.Length; ++i)
+            for (int i = 0; i < input.Length; i++)
             {
                 if (input[i] > ave)
                 {
@@ -209,7 +209,7 @@ static void Ascending(int[] input)
             Array.Sort(input);
 
             Console.WriteLine("Ascending:");
-            for (int i = 0; i < input.Length; ++i)
+            for (int i = 0; i < input.Length; i++)
             {
                 Console.Write($" {input[i]}");
             }
@@ -228,7 +228,7 @@ static void Shuffle(int[] input)
             int temp = 0;
 
             Console.WriteLine("Shuffle:");
-            for (int i = 0; i < N; ++i)
+            for (int i = 0; i < N; i++)
             {
                 temp = random.Next(0, All.Count - 1);
                 Console.Write($" {All[temp]}");