C#小练习ⅴ

水深无声 2022-07-15 14:16 197阅读 0赞

使用交错数组int\[\]\[\]实现书上矩阵例题5.3：

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    namespace test
    {
        class Program
        {
            static void Main(string[] args)
            {
                int sum=0;
                int[][] a = new int[][]
                {
                     new int[]{1,2,3,4},
                     new int[]{5,6,7,8},
                     new int[]{9,10,11,12},
                     new int[]{13,14,15,16}
                };
                Console.WriteLine("a.Length: " + a.Length + "a.GetLength(0): " + a.GetLength(0) + "a[0].GetLength(0): " + a[0].GetLength(0) + "a[0].Length: " + a[0].Length);
                Console.WriteLine("数组为：");
                for (int i = 0; i < a.Length; i++)
                {
                    Console.WriteLine();
                    for (int j = 0; j < a[i].Length; j++)
                    {
                        Console.Write("{0,4}", a[i][j]);
                    }
    
                }
                Console.WriteLine("\n输出上三角：");
                for (int i = 0; i < a.Length; i++)
                {
                    Console.WriteLine();
                    for (int k = i; k >0; k--)
                    {
                        Console.Write("   ");
                    }
                    for (int j = i; j < a[i].Length; j++)
                    {
    
                        Console.Write("{0,3}", a[i][j]);
                    }
                }
                Console.WriteLine("\n输出上三角：");
                for (int i = 0; i < a.Length; i++)
                {
                    Console.WriteLine();
                   
                    for (int j = 0; j <=i; j++)
                    {
    
                        Console.Write("{0,3}", a[i][j]);
                    }
                }
                Console.WriteLine("\n求对角线数：");
                for (int i = 0; i < a.Length; i++)
                {
                    for (int j = 0; j < a[i].Length; j++)
                    {
                        if (i==j)
                        {
                            Console.Write("{0,4}",a[i][j]);
                            sum += a[i][j];
                        }
                      
                    }
                }
                Console.WriteLine("\n求对角线和：{0,4}",sum);
             
                for (int i = 0; i < a.Length; i++)
                {
                    for (int j = i; j < a[i].Length; j++)
                    {
                        int temp;
                        temp = a[i][j];
                        a[i][j]=a[j][i];
                        a[j][i]=temp;
                        
                    }
                }
                Console.WriteLine("\n就地逆置：");
                for (int i = 0; i < a.Length; i++)
                {
                    Console.WriteLine();
                    for (int j = 0; j < a[i].Length; j++)
                    {
                        Console.Write("{0,4}",a[i][j]);
    
                    }
                }
                Console.WriteLine();
            }
        }
    }

定义一个一维数组，其元素个数从键盘中输入，元素的值为\[100,200\]的随机整数。

（1）输出数组的每个数

（2）对数组的数进行升序排序，输出排序后的数组元素

（3）从键盘上输入一个整数，查找该整数是否存在，若存在输出其所在的下标，若不存在给出提示信息“不存在此数据”。

（4）将数组逆置，并输出

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    namespace _6_2
    {
        class Program
        {
            static void Main(string[] args)
            {
                int n = 0,bar,flag=1;
                n =int.Parse( Console.ReadLine());
                int[] a = new int[n];
                Random greate = new Random();
                for (int i = 0; i < n; i++)
                {
                    a[i] = greate.Next(100,201);
                    
                }
                for (int i = 0; i < n; i++)
                {
                    Console.Write("{0,4}", a[i]);
                    
                }
                Array.Sort(a);
                Console.WriteLine("\n排序后：");
                for (int i = 0; i < n; i++)
                {
                    Console.Write("{0,4}", a[i]);
                }
                Console.WriteLine("\n输入查询整数：");
                bar = int.Parse(Console.ReadLine());
                for (int i = 0; i < n; i++)
                {
                    if (a[i]==bar)
                    {
                        Console.WriteLine("次整数下标："+i);
                        flag = 0;
                        break;
                    }
                    
                }
                if (flag==1)
                {
                    Console.WriteLine("不存在此数据");
                }
                Array.Reverse(a);
                Console.WriteLine("\n数组逆置后：");
                for (int i = 0; i < n; i++)
                {
                    Console.Write("{0,4}",a[i]);
                    
                }
    
    
    
    
            }
        }
    }

设计程序，用一个二维数组存放5个学生的4门功课的考试成绩，求每个学生的平均成绩。

using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    
    namespace _6_3
    {
        class Program
        {
            static void Main(string[] args)
            {
                int[] b = new int[5]{0,0,0,0,0};
                int[,] a = new int[5, 4]
                {
                {76,89,76,47},
                {80,96,58,97},
                {97,85,79,84},
                {79,90,89,78},
                {98,65,87,86}
                };
               // Console.WriteLine(a.GetLength(0));
                // Console.WriteLine(a.GetLength(1));
                for (int i = 0; i < a.GetLength(0); i++)
                {
                    Console.WriteLine();
                    for (int j = 0; j < a.GetLength(1); j++)
                    {
                        Console.Write("{0,3}",a[i,j]);
                        b[i] += a[i, j];
                    }
                }
                Console.WriteLine("\n每个学生的平均成绩：");
                for (int i = 0; i < b.Length; i++)
                {
                    Console.Write("{0,3}",b[i]/4);
                }
                Console.WriteLine();
            }
        }
    }