C++实验报告--

实验报告实验课程：C++语言程序设计学生姓名：学号：专业班级：20年 12 月 20 日目录一．实验五 (3)二．实验六 (6)三．实验七 (10)四．实验八 (18)五．实验九 (22)南昌大学实验报告五学生姓名：学号：专业班级：实验类型：■验证□综合□设计□创新实验日期：实验成绩：一、实验项目名称C++多种情况的测试二、实验目的1、测试对象指针的相关概念6.2.112、测试指针型函数3、测试指向常量的指针和指针类型的常量。

三、实验基本原理和内容1.程序为：#include<iostream>using namespace std;class Point{public:Point(int xx=0,int yy=0){ X=xx;Y=yy;}Point(Point &p);int GetX(){return X;}int GetY(){return Y;}static void GetC(){ cout<<"Object id="<<countP<<endl;}//静态函数成员；static int countP;// 静态数据成员引用性说明；private:int X,Y;};Point::Point(Point &p){X=p.X;Y=p.Y;countP++;}int Point::countP=0;void main(){Point A(4,5);//对象指针的一般概念Point *p1;// 声明对象指针；p1=&A; //初始化指针；（如果不进初始化会报错）cout<<p1->GetX()<<endl; //利用指针访问对象成员（改为：（*p1）.GetX() ,运行结果不变）；cout<<A.GetX()<<endl; //利用对象名访问对象成员；//指向类的非静态成员的指针Point *p2=&A;// 声明对象指针并初始化；int (Point::*p_GetX)()=&Point::GetX;//声明成员函数指针并初始化；cout<<(A.*p_GetX)()<<endl; //使用成员函数指针访问成员函数；cout<<(p2->GetX)()<<endl;//使用对象指针访问成员函数；cout<<A.GetX()<<endl;//使用对象名访问成员函数；//指向类的静态的成员指针int*count=&Point::countP;//声明一个int型指针，指向类的静态成员；cout<<"Object id="<<*count<<endl;//直接通过指针访问静态数据成员；Point B(A); //声明对象B;cout<<"Point B,"<<B.GetX()<<","<<B.GetY();cout<<"Object id="<<*count<<endl;//直接通过指针访问静态数据成员;void (*gc)()=Point::GetC; //声明一个指向函数的指针，指向类的静态成员函数;cout<<"Point A,"<<A.GetX()<<","<<A.GetY();//输出对象序号，直接通过指针访问静态函数成员;gc();Point C(A); //声明对象Bcout<<" Point C,"<<C.GetX()<<","<<B.GetY();gc();//输出对象序号，直接通过指针访问静态函数成员;}2.与3和程序：#include<iostream>using namespace std;void (*sum)(int x,int y);//声明指针型函数;void itssum(int m,int n);void main(){const char*name="John";//指向常量的指针;char*const name1="John1";//指针型常量,本身的值不能改变;char s[]="abc";name=s; //name本身的值可以改变,但不能改变name 所指的对象;cout<<" "<<name<<endl;cout<<" "<<name1<<endl;sum=itssum;//函数指针指向itssum;sum(2,3);//函数指针的调用;}void itssum(int m,int n){int sum=0;sum=m+n;cout<<"这两个数相加的和为：";cout<<"sum="<<" "<<m<<"+"<<n<<" "<<"="<<sum<<endl;}四、主要仪器设备及耗材PC机一台五、实验数据及处理结果1.结果为：2.结果为：六、参考资料C++语言程序设计（郑莉，董渊，张瑞丰编著）;南昌大学实验报告六学生姓名：学号：专业班级：实验类型：■验证□综合□设计□创新实验日期：实验成绩：一、实验项目名称C++多种情况的测试二、实验目的1.例题6-19 释放掉三维数组2.例题6-243.弄清楚6.4节。

三、实验基本原理和内容a)程序为：#include<iostream>using namespace std;int main(){float (*cp)[2][3];int i,j,k;cp=new float[2][2][3];for(i=0;i<2;i++)for(j=0;j<2;j++)for(k=0;k<3;k++)*(*(*(cp+i)+j)+k)=i*100+j*10+k;for(i=0;i<2;i++){for(j=0;j<2;j++){ for(k=0;k<3;k++)cout<<cp[i][j][k]<<" "<<" ";cout<<endl;}cout<<endl;}}b)程序为：#include<iostream>#include<string>using namespace std;void turefalse(int x);int main(){string S1="abc",S2="123";int i=5,j;char P1[]="ABCD";cout<<"S1==P1,returned";turefalse(S1==P1);cout<<"S1<P1,returned";turefalse(S1<P1);cout<<"Now S1 is:"<<" "<<S1<<endl;cout<<"Length of S1:"<<" "<<S2.length()<<endl;S1+=S2;cout<<"After S1+=S2,now S1 is:"<<" "<<S1<<endl;cout<<"Length of S1:"<<" "<<S1.length()<<endl;cout<<"Now S2 is:"<<" "<<S2<<endl;S2=S1;cout<<"After S2=S1,now S2 is:"<<" "<<S2<<endl;j=S1[i];cout<<" i=5,j=S1[i],now j is:"<<" "<<j<<endl;}void turefalse(int x){cout<<(x? "Ture":"False")<<endl;}c)程序为:#include<iostream>using namespace std;class Point{public:Point(int xx=0,int yy=0){ X=xx;Y=yy;}Point(Point &p);~Point(){ cout<<"Destructir called.(深拷贝构造函数被调用）"<<endl;delete[];}int GetX(){return X;}int GetY(){return Y;}private:int X,Y;};Point::Point(Point &p){X=p.X;Y=p.Y;cout<<"浅拷贝构造函数被调用"<<endl; }void fun1(Point p){ cout<<p.GetX()<<endl;}void main(){Point A(4,5);fun1(A);}四、主要仪器设备及耗材PC机一台五、实验数据及处理结果a)结果为：b)结果为:c)结果为：六、参考资料C++语言程序设计（郑莉，董渊，张瑞丰编著）;南昌大学实验报告七学生姓名：学号：专业班级：实验类型：■验证□综合□设计□创新实验日期：实验成绩：一、实验项目名称C++多种情况的测试与编程二、实验目的第七章5-11题三、5-11题实验基本原理和内容7-5:#include<iostream>using namespace std;const float PI=(float)3.14159;class Shape{public:Shape(){}~Shape(){}void GetArea(){}};class Rectangle:public Shape{public:Rectangle(float ItsLong,float ItsWide){Long=ItsLong;Wide=ItsWide;} ~Rectangle(){}float GetArea(){return Long*Wide;}private:float Long,Wide;};class Circle:public Shape{public:Circle(float Itsradius){ radius=Itsradius;}float GetArea(){return PI*radius*radius;}private:float radius;};class Square: public Rectangle{public:void GetArea(){}private:float Long,Wide;};void main(){float itsLong,itsWide,itsradius;cout<<"请你输入长方形的长和宽：";cin>>itsLong>>itsWide;Rectangle Re(itsLong,itsWide);if(itsLong==itsWide){cout<<"矩形的面积为："<<Re.Rectangle::GetArea()<<endl;} elsecout<<"长方形面积为："<<Re.Rectangle::GetArea()<<endl;cout<<"请输入圆的半径：";cin>>itsradius;Circle Ci(itsradius);cout<<"圆的面积为："<<Ci.Circle::GetArea()<<endl;}7-6:#include<iostream>using namespace std;class Mammal{public:Mammal(){ cout<<" Mammal()"<<endl;}~Mammal(){ cout<<" ~Mammal()"<<endl;}};class Dog:public Mammal{public:Dog(int itsage){age=itsage; cout<<"It is a dog."<<endl;} ~Dog(){ cout<<" ~Dog "<<endl;}int Dogage(){return age;}private:int age;};void main(){Dog mydog(5);mydog.Dogage();}7-7:#include<iostream.h>class BaseClass{public:BaseClass(){ cout <<"(1)构造基类对象!"<< endl;} };class DerivedClass : public BaseClass{public:DerivedClass(){ cout <<"(2)构造派生类对象!"<< endl;} };void main(){DerivedClass d;}7-8:#include<iostream.h>#include<string.h>class Document{public:Document(){};Document( char*name );char*Name; // Document name.void PrintNameOf(); // Print name. };Document::Document( char*name ) {Name =new char[ strlen( name ) + 1 ]; strcpy( Name, name );};void Document::PrintNameOf(){cout << Name << endl;}class Book : public Document{public:Book( char*name, long pagecount );void PrintNameOf();private:long PageCount;};Book::Book( char*name, long pagecount ):Document(name) {PageCount = pagecount;}void Book::PrintNameOf(){cout <<"Name of book: ";Document::PrintNameOf();}void main(){Document a("Document1"); Book b("Book1",100);b.PrintNameOf();}7-9:#include<iostream>using namespace std;class Base{public:int fn1() const{return 1; } int fn2() const{return 2; }};class Derived : private Base {public:int fn1() {return Base::fn1();};int fn2() {return Base::fn2();};};void main(){Derived a;a.fn1();}7-10:#include<iostream>using namespace std;class object{public:object(){ cout <<"构造object对象"<< endl;Weight = 0;} int GetWeight(){return Weight;}void SetWeight(int n){ Weight = n;}~object() { cout <<"析构object对象"<< endl;}private:int Weight;};class box : public object{public:box(){ cout <<"构造box对象"<< endl;Height = Width = 0;} int GetHeight(){return Height;}void SetHeight(int n){ Height = n;}int GetWidth(){return Width;}void SetWidth(int n){ Width = n;}~box() { cout <<"析构box对象"<< endl;}private:int Height,Width;};void main(){box a;7-11:#include<iostream>using namespace std;class BaseClass{public:void fn1(){ cout <<"调用基类的函数fn1()"<< endl;}void fn2(){ cout <<"调用基类的函数fn2()"<< endl;} };class DerivedClass : public BaseClass{public:void fn1(){ cout <<"调用派生类的函数fn1()"<< endl;} void fn2(){ cout <<"调用派生类的函数fn2()"<< endl;}};void main()DerivedClass aDerivedClass;DerivedClass *pDerivedClass =&aDerivedClass;BaseClass *pBaseClass =&aDerivedClass;aDerivedClass.fn1();aDerivedClass.fn2();pBaseClass->fn1();pBaseClass->fn2();pDerivedClass->fn1();pDerivedClass->fn2();}四、主要仪器设备及耗材PC机一台五、实验数据及处理结果a)结果为：b)结果为：c)结果为：d)结果为：e)结果为：f)结果为：g)结果为：六、参考资料C++语言程序设计（郑莉，董渊，张瑞丰编著）;南昌大学实验报告八学生姓名：学号：专业班级：实验类型：■验证□综合□设计□创新实验日期实验成绩：一、实验项目名称C++多种情况的测试与编程二、实验目的1. 八种情况2. 7.5.3的例题测试3. 7.5.2的第一个例题测试三、实验基本原理和内容1.程序为：#include<iostream>using namespace std;void*pv;int*print;//void vobject,错误，不能声明void 类的型的变量;int i=5;void main(){char*name1="John";char s[]="abc";name1=s;//如果定义*name1='1',则会报错，不能改变name1 所指的对象;cout<<name1<<endl;char*const name2="John2";//如果name2="abc",错误，name2是指针常量，值不能改变;cout<<name2<<endl;pv=&i;print=(int*)pv;cout<<pv<<endl;}2.程序为：#include<iostream>using namespace std;class B0{public:B0(int n){ nV=n;cout<<"Member of B0."<<endl;}int nV;void fun(){ cout<<"Member of B0"<<endl;}};class B1:virtual public B0 //声明B0为虚基类,不会初始化; {public:B1(int a):B0(a){}int nV1;};class B2: public B0//声明B0不是虚基类，会初始化; {public:B2(int a):B0(a){}int nV2;};class D1:public B1,public B2{public:D1(int a):B0(a),B1(a),B2(a){}//因为B0为虚基类，所以只初始化一次;int nVd;void fund(){ cout<<"Member of D1"<<endl;}};void main(){cout<<"因为在B1中声明B0为虚基类，则不会初始化;\n";cout<<"在B2中声明B0不是虚基类，则会初始化.所以初始化情况为：\n";D1 d1(1);d1.nVd=2;cout<<"调用函数运行结果为：\n";d1.fund();}3.程序为：#include<iostream>using namespace std;class B0{public:void fun(){ cout<<"Member of BO"<<endl;} };class B1:virtual public B0{public:int nV1;};class B2:virtual public B0{public:int nV2;};class D1:public B1,public B2{public:int nVd;void fund(){ cout<<"Member of D1"<<endl;} };int main(){d1.nV=2;cout<<"定义与调用为：d1.nV=2，d1.fun()"<<endl;d1.fun();d1.B1::nV=2;//加上作用域限定符;cout<<"定义与调用为：d1.B1::fun()，d1.B1::fun()"<<endl;d1.B1::fun();//加上作用域限定符；cout<<"加上作用域限定符后，结果是一样的。