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  • <C#任务导引教程>练习三

    /*Convert.ToInt("213165");

    int a=12345;
    string sn=a.ToString();//把a转换成字符串sn
    int b=int.Parse(sn);//把sn转换成整数b,结果b=a*/

    using System;
    class Program
    {
        static void Main()
        {
            short i = 289;
            byte b;
            b = (byte)i;//产生截断,即减去256,得到33,而 ! 的ASCII码就是33
            char c = (char)b;
            Console.WriteLine("{0}", c);
        }
    }

    //14,用foreach语句输出字符串型数组
    using System;
    class Program
    {
        static void Main()
        {
            string[] WeekDays = new string[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
            Console.WriteLine("该数组的长度为:{0}", WeekDays.Length);
            Console.WriteLine("以下为数组内容:");
            int i = 1;
            foreach (string day in WeekDays)
                Console.WriteLine("该值为数组的第{0}个值--{1}", i++, day);
        }
    }

    //15,完成任务
    using System;
    class Program
    {
        static void Main()
        {
            int i;
            int[] f = new int[20];
            f[0] = 1;
            f[1] = 1;
            for (i = 2; i < f.Length; i++)
                f[i] = f[i - 2] + f[i - 1];
            for(i=0;i<f.Length;i++)
            {
                if (i % 5 == 0 && i > 0)
                    Console.WriteLine();
                Console.Write("{0,8}", f[i]);
            }
            Console.WriteLine();
        }
    }
    //16,有10位学生的成绩分别是,,,,试编写程序输出10个学生的成绩,找出其中的最高分极其在这批数中德位置
    using System;
    class Program
    {
        static void Main()
        {
            int[] scores = new int[11] { 0, 67, 34, 90, 88, 55, 74, 95, 82, 43, 90 };
            int i, max, max_in;
            max = scores[1];
            max_in = 1;
            for(i=2;i<scores.Length;i++)
            {
                if (scores[i] > max)
                {
                    max = scores[i];
                    max_in = i;
                }
                Console.WriteLine("输出10个学生的成绩:");
                for (i = 1; i < scores.Length; i++)
                {
                    Console.Write("{0}  ", scores[i]);
                }
                Console.WriteLine();
                Console.WriteLine("最高分:{0}", max);
                Console.WriteLine("第一个最高分的位置:{0}", max_in);
            }
        }
    }
    //17,用冒泡法和选择法分别将由键盘输入的十个整数拍成升序
    using System;
    class Program
    {
        static void Main()
        {
            int[] a = new int[] { 9, 8, 5, 6, 2, 0 };
            int i, j, t;
            for(i=0;i<6-1;i++)
                for(j=0;j<6-1-i;j++)
                    if(a[j]>a[j+1])
                    {
                        t = a[j];
                        a[j] = a[j + 1];
                        a[j + 1] = t;
                    }
            Console.WriteLine("排序的结果是:");
            for (i = 0; i < 6; i++)
                Console.Write("{0}  ", a[i]);
            Console.WriteLine();
        }
    }
    //18,冒泡排序,手动输入
    using System;
    class Program
    {
        static void Main()
        {
            int[]a=new int[10];
            int i,j,t;
            Console.WriteLine("请输入十个整数:");
            for (i = 0; i < 10; i++)
            {
                a[i] = Convert.ToInt32(Console.ReadLine());
            }
            Console.WriteLine();
            for(i=0;i<10-1;i++)
                for (j = 0; j < 10 - 1 - i; j++)
                    if(a[j]>a[j+1])
                {
                    t = a[j];
                    a[j] = a[j + 1];
                    a[j + 1] = t;
                }
            for (i = 0; i < 10; i++)
            {
                Console.Write("{0}  ", a[i]);
                Console.WriteLine();
            }
        }
    }
    //19,选择法 将六个已知整数排成升序
    using System;
    class Program
    {
        static void Main()
        {
            int[ ] a = new int[ ] { 9, 8, 5, 6, 2, 0 };
            int i, j, t;
            for (i = 0; i < 6 - 1; i++)
                for (j = i + 1; j < 6; j++)
                    if (a[i] > a[j])
                    {
                        t = a[i];
                        a[i] = a[j];
                        a[j] = t;
                    }
            Console.WriteLine("排序的结果为:");
            for(i=0; i<6; i++)
                Console.Write("{0}  ",a[i]);
            Console.WriteLine();
        }
    }

    //20,用选择法 对 十个键盘输入的数 排升序
    using System;
    class Program
    {
        static void Main()
        {
            int[] a = new int[10];
            int i, j, t;
            Console.WriteLine("请输入十个整数");
            for (i = 0; i < 10; i++)
            {
                a[i] = Convert.ToInt32(Console.ReadLine());
            }
            Console.WriteLine();
            for(i=0;i<10-1;i++)
                for (j = i + 1; j < 10; j++)
                    if (a[i] > a[j])
                    {
                        t = a[i];
                        a[i] = a[j];
                        a[j] = t;
                    }
            for (i = 0; i < 10; i++)
            {
                Console.Write("{0}  ", a[i]);
            }
            Console.WriteLine();
        }
    }
    //21,二维数组的声明
    using System;
    class Program
    {
        static void Main()
        {
            int [ , ]score=new int[3,5];
            score = new int[,] { { 97, 87, 92, 78, 83 }, { 97, 87, 92, 78, 83 }, { 70, 65, 80, 91, 76 } };
            Console.Write("课程1 课程2 课程3 课程4 课程5");
            string str = " ";
            for(int i=0;i<score.GetLength(0);i++)
            {
                for (int j = 0; j < score.GetLength(1); j++)
                {
                    str += " ";
                    str += score[i, j].ToString() + " ";//制表
                }
                str += " ";//换行
            }
            Console.WriteLine(str);
        }
    }
    //22,用二维数组实现矩阵转置
    using System;
    class Program
    {
        static void Main()
        {
            int i, j, d;
            int[,] data = new int[5,5];
            for (i = 0; i < 5; i++)
                for (j = 0; j < 5; j++)
                    data[i, j] = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("转置前的矩阵:");
            for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 5; j++)
                    Console.Write("{0,4 }", data[i, j]);
                Console.WriteLine();
            }
            for(i=0;i<5-1;i++)
                for (j = i + 1; j < 5; j++)//实现矩阵的转置
                {
                    d = data[i, j];
                    data[i, j] = data[j, i];
                    data[j, i] = d;
                }
            Console.WriteLine(" 转置后的矩阵:");
            for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 5; j++)
                    Console.Write("{0,4}", data[i, j]);
                Console.WriteLine();
            }
        }
    }

    //23,字符数组的输出
    using System;
    class Program{
        static void Main(){
            char[] c = new char[10] { 'I', ' ', 'a', 'm', ' ','a',' ', 'b', 'o', 'y' };
            int i;
            for (i = 0; i < 10; i++)
            {
                Console.Write("{0}", c[i]);
            }
            Console.WriteLine();
        }
    }
    //24.二维字符数组输出
    using System;
    class Program
    {
        static void Main()//二维字符数组
        {
            char[ , ] d = new char[5, 5] { { ' ', ' ', '*', ' ', ' ' }, { ' ', '*', ' ', '*', ' ' }, { '*', ' ', ' ', ' ', '*' }, { ' ', '*', ' ', '*', ' ' }, { ' ', ' ', '*', ' ', ' ' } };
            int i, j;
            for (i = 0; i < 5; i++)
            {
                for (j = 0; j < 5; j++)
                    Console.Write("{0}", d[i, j]);
                Console.WriteLine();
            }
        }
    }
    //25,创建一个控制台应用程序,使用string类声明一个字符串变量并进行初始化,然后获取该字符串中的某个字符
    using System;
    class Program
    {
        static void Main()
        {
            string str = "我钟爱C#!";
            char ch1 = str[1];
            char ch2 = str[2];
            Console.WriteLine("字符串:{0}中德第2个字符是:{1}",str,ch1);
            Console.WriteLine("字符串:{0}中的第3个字符是:{1}",str,ch2);
        }
    }
    //26,创建一个控制台应用程序,声明两个string类型的变量str1和str2,然后使用Format方式格式化这两个string变量,最后输出格式化后的字符串
    using System;
    class Program
    {
        static void Main()
        {
            string str1= "努力学习C#!";
            string str2 = "饱尝编程的愉悦";
            string newstr = String.Format("{0},{1}!!!", str1, str2);
            Console.WriteLine(newstr);
        }
    }

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  • 原文地址:https://www.cnblogs.com/zhangyongjian/p/3619601.html
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