C#程序题运行结果题.doc

三 写出运行结果题(1)using System;class Program static void Main() int x = 3; Console.Write(星期:); Console.WriteLine(Weekday)x); Console.Write(月份:); Console.WriteLine(Month)x); Console.Write(季节:); Console.WriteLine(Season)x); enum Weekday 未知 = -1, 星期天, 星期一, 星期二, 星期三, 星期四,星期五,星期六 enum Month 一月, 二月, 三月, 四月, 五月, 六月, 七月, 八月, 九月, 十月, 十一月, 十二月, 未知 = -1星期: 星期三月份: 四月季节:3 enum Season 春, 夏 = 2, 秋 = 4, 冬 = 8 (2)using System;class Program static void Main() class1 c1 = new class1(); class1.y = 5; c1.Output(); class1 c2 = new class1(); c2.Output(); public class class1050055 private static int x = 0; public static int y = x; public int z = y; public void Output() Console.WriteLine(class1.x); Console.WriteLine(class1.y); Console.WriteLine(z); (3)using System;class Program static void Main() IA ia = new B(); Console.WriteLine(0 1 2 4, ia is IA, ia is IB, ia is A, ia is A, ia is B, ia is C); public interface IA public interface IB : IA True True False Truepublic class A : IA public class B : IB public class C : B, IB （4）using System;class Program static void Main(string args) MyClass y = new MyClass(); BaseClass x = y; x.i = 100; Console.WriteLine(0, 1, x.i, y.i); class BaseClass public int i;100，0class MyClass : BaseClass public new int i;（5）using System;class Program static void Main(string args) MyClass x = new MyClass(); x.testParams(0); x.testParams(0, 1); x.testParams(0, 1, 2); class MyClass public void testParams(params int arr) Console.Write(使用Params参数！); public void testParams(int x, int y) Console.Write(使用两个整型参数！);使用Params 参数！使用两个整型参数！使用Params 参数！ (6)using System;namespace P7_3 public class VirtualInheritSample public static void Main() DerivedClass c = new DerivedClass(); c.Call(); public class BaseClass public void A() Console.WriteLine(Base A); public virtual void B() Console.WriteLine(Base B); public class DerivedClass : BaseClass public new void A() Console.WriteLine(Derived A); public override void B() Console.WriteLine(Derived B); public void Call() this.A(); this.B(); (BaseClass)this).A(); (BaseClass)this).B(); (7)using System;namespace P7_6 public class SealedSample Derived ADerived BBase ADerived B public static void Main() A a = new A1(); a.Output(); a = new A2(); a.Output(); a = new A1_1(); a.Output(); a = new A1_2(); a.Output(); public abstract class A public abstract void Output(); public class A1 : A public override sealed void Output() Console.WriteLine(A1); public sealed class A2 : A public override void Output() Console.WriteLine(A2); A1A2A1A1 public class A1_1 : A1 public class A1_2 : A1 public new void Output() Console.WriteLine(A1_2); (8)using System;class CounterDown int val; public CounterDown(int n) val = n; public int count() if (val 0) Console.Write(i + ); i = cd1.count(); (9)using System;class StringDe public void f(string s) for (int j = 0; j 0) return x-; else return 0; class Test static void Main() 81 64 49 36 25 16 9 4 1 A a = new A(9); int j = a.F(); while (j 0) Console.Write(0 , j * j); j = a.F(); (11)using System;class Sumw static void Main() int x = 0, y = 0; do x = x + 1;y=5 if (x % 2 != 0) continue; y = y + 1; while (x = 10); Console.WriteLine(y=0, y); (12)using System;class MyTest public void swap(ref int x, ref int y) int temp = x; x = y; y = temp; class test static void Main() a=8 b=6 int a = 6, b = 8; MyTest app = new MyTest(); app.swap(ref a, ref b); Console.WriteLine(a=0 b=1, a, b); 四 改错题(1) 要求程序的运行结果为：7913using System;class Program static void Main() Console.WriteLine(OuterClass.x); Console.WriteLine(OuterClass.InnerClass.y); Console.WriteLine(OuterClass.inner.z); public class OuterClass public const int x = 7;public static readonly InnerClass inner ;public class InnerClass public const int y = 9; public readonly int z = 13; 答：字段“inner”没有初始化，此行应改为public static readonly InnerClass inner = new InnerClass();（2）要求程序的运行结果为：5103using System;class Program int x = 1; static int y = 2; const int z = 3; public Program() x = 5; y = 10; static Program() x = 5; y = 10; void F() x *= 2; y *= 2; static void Main() Program p = new Program(); Console.WriteLine(p.x); Console.WriteLine(Program.y); Console.WriteLine(p.z); 答：l 在静态构造函数中不能访问实例字段，“x = 5;”应删除；l 静态字段只能通过类名来访问，“Console.WriteLine(p.z);”应改为“Console.WriteLine(Program.z);”（3）要求程序的运行结果为：123using System;class Program private static void Main() Counter p = new Counter(); Console.WriteLine(p.Next); p = new Counter(); Console.WriteLine(p.Next); p = new Counter(); Console.WriteLine(p.Next); class Counter private int next = 1; public int Next() get return next+; 答：l 字段“next”应该为静态字段，“private int next = 1;”应改为“static private int next = 1;”l 属性“Next”的语法不对，“public int Next()”应改为“public int Next”（4）要求能通过编译public abstract class A private int m_x = 0; public virtual int X get return m_x; set m_x = value; public abstract int Y get; set; public class B : A private int m_y = 0; public new int X set base.m_x = value 0 ? 0 : value; public override int Y get return m_y; 答：l 在“B”类的“X”属性的“set”访问器中，不能访问基类的是有字段“m_x”，“base.m_x = value 0 ? 0 : value;”应改为“base.X = value 0 ? 0 : value;”l 在“B”类的“Y”属性中，没有提供“set”访问器，应将基类中的“public abstract int Y get; set; ”改为“public abstract int Y get; ”(5) 要求能通过编译public abstract class Base public abstract string Name get; set; public class MyClass string _nsg; public override string Name get return this._nsg; 答：l “MyClass”类应该从“Base”继承，“public class MyClass”应改为“public class MyClass ： Base”l “MyClass”类的“Name ”属性没有提供set访问器，应添加“set this._nsg = value; ”(6) 要求能通过编译internal class Basepublic class MyClass : Base 答：l 派生类“MyClass”与基类“Base”的访问限制有矛盾，“internal class Base”应改为“public class Base”(7)要求程序的运行结果为：A1A2A1A1_2using System;namespace P7_6 public class SealedSample public static void Main() A a = new A1(); a.Output(); a = new A2(); a.Output(); a = new A1_1(); a.Output(); a = new A1_2(); a.Output(); public abstract class A public abstract void Output(); public class A1 : A public override sealed void Output() Console.WriteLine(A1); public sealed class A2 : A public override void Output() Console.WriteLine(A2); public class A1_1 : A1 public class A1_2 : A1 public new void Output() Console.WriteLine(A1_2); 答：l 应将“Main”函数中最后一行“a.Output();”改为“(A1_2)a).Output();”（8）要求能通过编译if (gender=1) Console.WriteLine(Girl); else; Console.WriteLine(Boy);答：“if (gender=1)”应改为“if (gender=1)”“else;”应改为“else”（9）要求能通过编译public class studentpublic int No; private string Name; class Test static void Main() student s = new student(); p.No = 16; p.Name = Tom; 答：l “private string Name;”应改为“public string Name;”l “student s = new student();”应改为“student p = new student();”(10) 要求能通过编译class EventDemo static void Main() int i; for (int i = 0; i 100; i += 3) j = i * 3 + 1; Console.WriteLine(0t, j, n); / Console.WriteLine(0t1, j, i); i += 3; 答：“int i;”应改为“int j;”(11) 要求能通过编译public class Employee public int ID; double Salary;class A static void Main() Employee e = new Employee(); e.ID = 16; e.Salary = 1286; 答：“double Salary;”应改为“public double Salary;”(12) 要求能通过编译using System;class Teststatic void Main() int k; k = Console.ReadLine(); if (k = 10) k = k + 1; else if (10 k 30) k = k * 2 - 20; Console.WriteLine(k=0 , k); 答： “k = Console.ReadLine()”应改为“k = int.Parse(Console.ReadLine();”“else if (10 k = 20)”应改为“else if (k = 20)”(13) 要求能通过编译using System;class Sumw static void Main() x = 1; do y = 3x + 1; Console.WriteLine(0 , y); x += 3; while (x 100) 答：l “x = 1;”应改为“int x = 1;”l “y = 3x + 1;”应改为“int y = 3 * x + 1;”l “while (x 100)”应改为“while (x 100);”（14）要求能通过编译using System;abstract class MyTest public double n;class test static void Main() MyTest p = new MyTest(); p.n = 10; Console.WriteLine(p.n); 答：“abstract class MyTest”应改为“class MyTest”(15) 要求能通过编译using System;sealed class MyTest public double n;class test : MyTest static void Main() test p = new test(); p.n = 20; Console.WriteLine(p.n); 答：“sealed class MyTest”应改为“class MyTest”(16) 要求能通过编译using System;static class MyTest public double n;class test static void Main() MyTest.n = 30; Console.WriteLine(MyTest.n); 答：l “public double n;”应改为“static public double n;”(17) 要求能通过编译using System;class MyTest public const double x =2.0;class test static void Main() MyTest p = new MyTest(); p.x += 5.0; Console.WriteLine(p.x); 答：l “public const double x =2.0;”应改为“public double x =2.0;”(18) 要求能通过编译using System;class MyTest public readonly double x; public MyTest() x = 8.0; class test static void Main() MyTest p = new MyTest(); p.x += 2.5; Console.WriteLine(p.x); 答：l “public readonly double x;”应改为“public double x;”(19) 要求能通过编译using System;class MyTest public F() Console.WriteLine(MyTest.F); class test static void Main() MyTest p = new MyTest(); p.F(); 答：l “public F()”应改为“public void F()”(20) 要求能通过编译using System;class MyTest int x; internal int X() get return x; set x = valu