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1、五 程序填空题（红色位置为空，红色文字为答案）（1）字符及其ASCII码转换using System;namespace L2_1 class L2_1 static void Main() Console.Write(请输入一个字符: ); char ch = Console.ReadKey().KeyChar; Console.WriteLine(rn字符0的ASCII代码为1, ch, (int)ch); Console.Write(请输入一个整数:); int i = int.Parse(Console.ReadLine(); Console.WriteLine(ASCII码0对应的字
2、符为1, i, (char)i); (2) 字符串加密和解密using System;namespace L5_2 class L5_2 static void Main() Console.WriteLine(请输入一个字符串：); string text = Console.ReadLine(); Console.Write(请输入加密字符：); int key = Console.Read(); string text1 = ; foreach (char ch in text) text1 += (char)(ch key); Console.WriteLine(加密后的字符串为： +
3、 text1); string text2 = ; foreach (char ch in text1) text2 += (char)(ch key); Console.WriteLine(解密后的字符串为： + text2); (3) 坐标点类public class CzPoint private double x; private double y; public double X get return x; set x = value; public double Y get return y; set y = value; public CzPoint(double x, doub
4、le y) this.x = x; this.y = y; public void Move(double dx, double dy) x += dx; y += dy; public static bool operator =(CzPoint p1, CzPoint p2) return (p1.x = p2.x) & (p1.y = p2.y); public static bool operator !=(CzPoint p1, CzPoint p2) return (p1.x != p2.x) & (p1.y != p2.y); (4) 通过方法交换两个变量的值using Syst
5、em;namespace P3_1class FormalParametersSamplepublic static void Main()double x = 5;double y = 10;CzMath c = new CzMath(); Console.WriteLine(交换前x=0, y=1, x, y); /c.Swap(x, y); c.Swap(ref x, ref y); Console.WriteLine(交换后x=0, y=1, x, y);class CzMath public void Swap(ref double x, ref double y) double t
6、emp = x; x = y; y = temp; （5）排序输出三个数并求和using System;namespace P3_6 class VariableInitiationSample static void Main() double sum; CzMath.Output(out sum, 1, 2.5, 5); class CzMath /交换两个数的值 public static void Swap(ref double x, ref double y) double temp = x; x = y; y = temp; /排序输出三个数并求和 public static vo
7、id Output(out double sum, params double array) sum = 0; if (array.Length != 3) return; sum = array0 + array1 + array2; if (array0 array1) Swap(ref array0, ref array1); if (array1 array2) Swap(ref array1, ref array2); if (array0 array1) Swap(ref array0, ref array1); Console.WriteLine(0 1 2, array0, a
8、rray1, array2); Console.WriteLine(sum); （6）闰年测试using System;namespace P4_11class LogicalConditionOperationpublic static void Main()int year; Console.WriteLine(请输入一个年份：); if (int.TryParse(Console.ReadLine(), out year)if (year % 400) = 0 | (year % 4) = 0 & (year % 100) != 0)Console.WriteLine(闰年);elseC
9、onsole.WriteLine(非闰年); （7）using System;namespace P4_12 class Test public static void Main() BankCard card2 = new BankCard(); card2.m_id = 002; CreditCard cc = card2 as CreditCard; if (cc != null) cc.Borrow(50); else Console.WriteLine(0并非信用卡, card2.m_id); class BankCard public string m_id; class Cred
10、itCard : BankCard public uint m_debit; public void Borrow(uint x) m_debit = m_debit - x; Console.WriteLine(信用卡0: 贷款1元, m_id, x); （8）using System;namespace P4_3 class Test static void Main() Weekday day = Weekday.Sunday; Console.Write(day); enum Weekday Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday （9）using Sys
