实验四---2018-10-29

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace student_number
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] height = new int[10] {156,150,167,178,180,176,173,154,155,158};
            int i, sumHeight = 0, avgHeight, maxHeight = 0, minHeight = 500, overAvg = 0;
            Console.WriteLine("学生身高如下：");
            //显示数组内容
            for (i = 0; i < 10; i++)
            {
                Console.Write("{0,4}",height[i]);
            }
            //求身高总和，最大值，最小值
            for (i = 0; i < 10; i++)
            {
                sumHeight += height[i];
                if (height[i] > maxHeight) maxHeight = height[i];
                if (height[i] < minHeight) minHeight = height[i];
            }
            avgHeight = sumHeight / 10;
            for (i = 0; i < 10; i++)
            {
                if (height[i] > avgHeight) overAvg++;
            }
            Console.WriteLine("\n平均身高={0}，最高身高={1}，最低身高={2}", avgHeight, maxHeight, minHeight);
            Console.WriteLine("高于平均身高的学生人数={0}", overAvg);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace student_score
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] score = new int[10] {80,90,67,89,78,85,45,69,77,95};
            int i, ANum = 0, BNum = 0, CNum = 0, DNum = 0;
            Console.WriteLine("学生成绩如下：");
            for (i = 0; i < 10; i++) Console.Write("{0,4}",score[i]);
            //求成绩总和
            for (i = 0; i < 10; i++)
            {
                switch (score[i] / 10)
                {
                    case 10:
                    case 9:
                        ANum++;
                        break;
                    case 8:
                        BNum++;
                        break;
                    case 7:
                    case 6:
                        CNum++;
                        break;
                    default:
                        DNum++;
                        break;
                }
            }
            Console.WriteLine("\n优分数段（90~100）的学生人数是={0}，所占百分比={1:#0.##%}",ANum,ANum/10.0);
            Console.WriteLine("良分数段（80~90）的学生人数是={0}，所占百分比={1:#0.##%}", BNum, BNum / 10.0);
            Console.WriteLine("中分数段（70~80）的学生人数是={0}，所占百分比={1:#0.##%}", CNum, CNum / 10.0);
            Console.WriteLine("差分数段（60~70）的学生人数是={0}，所占百分比={1:#0.##%}", DNum, DNum / 10.0);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 冒泡排序
{
    class Program
    {
        public static void DisplayMatrix(int[] A)
        {
            //打印矩阵
            foreach(int i in A) Console.Write("{0,4}",i);
            Console.WriteLine();
        }
        static void Main(string[] args)
        {
            int i, t;
            int[] A = new int[10];
            Random rNum = new Random();
            for (i = 0; i < A.Length; i++) A[i] = rNum.Next(101);
            //数组A赋值随机数
            Console.WriteLine("原始数组：");
            DisplayMatrix(A);
            //冒泡排序
            int N = A.Length;
            for (int loop = 1; loop <= N - 1; loop++)//外循环进行N-1轮比较
            {
                for (i = 0; i <= N - 1 - loop; i++)//内循环两两比较
                {
                   if(A[i] < A[i+1])
                   {
                       t = A[i];
                       A[i] = A[i + 1];
                       A[i + 1] = t;
                   }
                }
            }
            Console.WriteLine("降序数组：");
            DisplayMatrix(A);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 选择排序
{
    class Program
    {
        public static void DisplayMatrix(int[] A)
        {
            //打印矩阵
            foreach (int i in A) Console.Write("{0,4}", i);
            Console.WriteLine();
        }
        static void Main(string[] args)
        {
            int i, t,MaxI;
            int[] A = new int[10];
            Random rNum = new Random();
            for (i = 0; i < A.Length; i++) A[i] = rNum.Next(101);
            //数组A赋值随机数
            Console.WriteLine("原始数组：");
            DisplayMatrix(A);
            //选择排序
            int N = A.Length;
            for (int loop = 0; loop <= N - 2; loop++)//外循环进行N-1轮比较
            {
                MaxI = loop;
                for (i = loop; i <= N - 1; i++)//内循环在无序数中找到最大值
                {
                    if (A[i] > A[MaxI]) MaxI = i;  
                }
                t = A[loop];
                A[loop] = A[MaxI];
                A[MaxI] = t;
            }
            Console.WriteLine("降序数组：");
            DisplayMatrix(A);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 矩阵加减
{
    class Program
    {
        public static void DisplayMatrix(int[,] A)
        {
            //打印矩阵
            for (int i = 0; i < A.GetLength(0); i++)
                for (int j = 0; j < A.GetLength(1); j++)
                    Console.Write("{0,4}",A[i,j]);
            Console.WriteLine();
        }
        static void Main(string[] args)
        {
            int i, j;
            int[,] A = new int[4, 4];
            int[,] B = new int[4, 4];
            int[,] C = new int[4, 4];
            int[,] D = new int[4, 4];
            Random rNum = new Random();
            for (i = 0; i < 4; i++)
                for (j = 0; j < 4; j++)
                    A[i, j] = rNum.Next(10,101);
            Console.WriteLine("数组A的内容："); DisplayMatrix(A);
            for (i = 0; i < 4; i++)
                for (j = 0; j < 4; j++)
                    B[i, j] = rNum.Next(10, 101);
            Console.WriteLine("数组A的内容："); DisplayMatrix(B);
            Console.WriteLine("上三角形式显示数组A的内容：");
            for (i = 0; i < 4; i++)
            {
                for (int k = 0; k < i * 5; k++) Console.Write(" ");
                for (j = i; j < 4; j++)
                    Console.Write("{0,4}",A[i,j]);
                Console.WriteLine();
            }
            Console.WriteLine("下三角形式显示数组A的内容：");
            for (i = 0; i < 4; i++)
            {
                for (j = 0; j < i+1; j++)
                    Console.Write("{0,4}", B[i, j]);
                Console.WriteLine();
            }
            for (i = 0; i < 4; i++)
                for (j = 0; j < 4;j++ )
                    C[i, j] = A[i, j] + B[i, j];
            Console.WriteLine("数组A和数组B的相加之和：");
            DisplayMatrix(C);
            for (i = 0; i < 4; i++)
                for (j = 0; j < 4; j++)
                    D[i, j] = A[i, j] - B[i, j];
            Console.WriteLine("数组A和数组B的相减之差：");
            DisplayMatrix(D);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 杨辉三角
{
    class Program
    {
        static void Main(string[] args)
        {
            int[,] A = new int[10,10];
            int i, j;
            for (i = 0; i < 10; i++)
                for (j = 0; j < 10; j++)
                    A[i, j] = 1;
             for (i = 0; i < 10; i++)
                 for (j = 1; j < i; j++)
                 {
                     A[i,j] = A[i-1,j] + A[i-1,j-1]; 
                 }
             for (i = 0; i < 10; i++)
             {
                 for (j = 0; j <= i; j++)
                     Console.Write("{0,5}",A[i,j]);
                 Console.WriteLine();
             }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace System.Array类
{
    class Program
    {
        static void Main(string[] args)
        {
            int i;
            int[] A = {80,90,67,89,78,85,45,69,77,95};
            Console.WriteLine("数组A的维数（秩rank）：{0}",A.Rank);
            Console.WriteLine("数组A的长度（元素总数）：{0}", A.Length);
            Console.WriteLine("数组A的内容：");
            //A.Length == A.GetLength(0);
            for (i = 0; i < A.GetLength(0); i++) Console.Write("{0,4}",A[i]);
            Array.Sort(A);
            Console.WriteLine("\n数组A排序后的内容：");
            for(i = 0;i < A.Length;i++) Console.Write("{0,4}",A[i]);
            Array.Reverse(A);
            Console.WriteLine("\n数组A排序反转后后的内容：");
            for (i = 0; i < A.Length; i++) Console.Write("{0,4}",A[i]);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace 指针操作
{
    unsafe class Program
    {
        public static void swap(int* pa, int* pb)
        {
            int t;
            t = *pa;
            *pa = *pb;
            *pb = t;
        }
        static void Main(string[] args)
        {
            int a, b, c;
            int* pa, pb, pc;
            Console.Write("请输入整数a：");
            string s = Console.ReadLine();
            a = int.Parse(s);
            Console.Write("请输入整数b：");
            s = Console.ReadLine();
            b = int.Parse(s);
            Console.Write("请输入整数c：");
            s = Console.ReadLine();
            c = int.Parse(s);
            Console.WriteLine("原始数据：a={0},b={1},c={2}", a, b, c);
            pa = &a; pb = &b; pc = &c;
            if (*pa > *pb) swap(pa, pb);
            if (*pa > *pc) swap(pa, pc);
            if (*pb > *pc) swap(pb, pc);
            Console.WriteLine("升序排序：a={0},b={1},c={2}", a, b, c);
        }
    }
}