程序阅读题.doc

类程序阅读题1. #includeusing namespace std;class Sample public: Sample(); Sample(int); Sample(); void display(); protected: int x;Sample:Sample() x=0; coutconstructing normallyn;Sample:Sample(int m) x=m; coutconstructing with a number: xendl;void Sample:display() coutdisplay a number:xendl;Sample:Sample() coutdestructingn;void main() Sample obj1; Sample obj2(20); obj1.display(); obj2.display();2.#include#include using namespace std;class studentidpublic:studentid(int id=0) value=id;coutAssigning student idvalueendl;studentid()coutdestructing idvalue endl;protected:int value;class studentpublic:student(char *pname=noname,int ssid=0):id(ssid)cout constructing studentpnameendl;strcpy(name,pname);namesizeof(name)-1=0;student()coutdestructing studentendl;protected:char name20;studentid id;void main()student s (randy,9818);2.class A public:int x;A(int i)x=i;void fun1(int j) x+=j;coutfun1:xendl;void fun2(int j) x+=j;coutfun2:xendl;void main() A c1(2),c2(5);void (A:*pfun)(int)=&A:fun1;(c1.*pfun)(5);pfun=&A:fun2;(c2.*pfun)(10);3#include class Rpublic:R(int r1,int r2) R1=r1;R2=r2;void print();void print() const;private:int R1,R2;void R:print()coutR1:R2endl;void R:print() constcoutR1;R2endl;void main()R a(5,4);a.print();const R b(20,52);b.print();4#includeusing namespace std; class Oldpublic:Old(int i=0)o=i;void Print()constcouto,;private:int o;class Newpublic:New()n=0;coutD-Constructor.n; New(int i, int j):d(i) n=j;coutConstructor.n;void Print()const d.Print(); coutnendl;New()coutDestructor.nendl;private: int n;Old d;New m1(8,1);void fun(New &m)New m0;m.Print();m0.Print();void main()const New m2(6,2);static New m3(3,3);New *p=new New(5,4);fun(m3);m1.Print();m2.Print();(*p).Print();delete p; 友元分析1. #includeusing namespace std; class X friend class Y;public:void Set(int i)x=i; void Display()coutx=x, y=y endl;private:int x;static int y; ;class Ypublic:Y(int i, int j);void Display();private:X a;int X:y=10;Y:Y(int i, int j) a.x=i; X:y=j;void Y:Display()coutx=a.x, y=X:yendl;void main( ) X b;b.Set(15);b.Display();Y c(16,19);c.Display();b.Display();2. #include#includeusing namespace std; class assistant;class professorchar pName40;int pAge;long pPhone;public:professor(char *pn, int pa, long pp)strcpy(pName, pn);pAge=pa;pPhone=pp;void display(assistant &a);class assistantchar aName40;int aAge;long aPhone;public:assistant(char *an, int aa, long ap)strcpy(aName, an);aAge=aa;aPhone=ap;friend void professor:display(assistant &a);void professor:display(assistant &a)cout ttNamettAgettTelephone endl;coutProfessor;couttpNamettpAgettpPhoneendl;coutAssistant;coutta.aNametta.aAgetta.aPhoneendl;void main( )professor p1(Joseph, 52,1335);assistant a1(Jack, 25, 8322);p1.display(a1);3#includeusing namespace std; class B;class Aint i;public: int set(B&);int get()return i;A(int x)i=x;class Bint i;public: B(int x)i=x;friend A; ;int A:set(B&b)return i=b.i; void main()A a(1);B b(2);couta.get(),;a.set(b);couta.get()endl;引用部分1#includeclass Test1public:Test1()coutCall Common Constructor! endl; Test1(const Test1& a) coutCall Copy Constructor! endl; Test1() coutCall Destructor!endl;Test1 fun1(Test1 a);Test1& fun2(Test1& a);void main()Test1 a;coutCall By Valueendl;fun1(a);coutCall By Referenceendl;fun2(a);Test1 fun1(Test1 a) coutReturn objectendl; return a;Test1& fun2(Test1& a) coutReturn Referenceendl; return a;2#include class Bint m;public:B(int i = 0) m=i;coutConstructor called.mendl;void Print( ) constcoutmendl;B( )coutDestructor called.mendl;void fun(const B &c)c.Print( );void main() fun(10);3分析程序运行结果，并指出程序中的潜在问题。int &fun();void main()int &rp=fun();int *p=&rp;cout*pendl;delete p;*p=10;coutrp;int &fun()int *p=new int;if(!p)coutError,Memory allocation failture!endl;exit(0);int &rp=*p;rp=5;return rp;4#include class Test;void fun1(Test t);Test fun2();class Testpublic:Test(int n=1) val=n;cout Con. endl;Test(const Test& t) val=t.val; coutCopy con.endl;Test& operator = (Test& t) val=t.val; coutAssignment.endl;return *this;private:int val;void main()Test t1(1);Test t2=t1;Test t3;t3=t1;fun1(t2);t3=fun2();void fun1(Test t)Test fun2()Test t;return t;5#includevoid main() int a=10,20,30,40,*pa=a; int *&pb=pa; pb+; cout*paendl;6。分析以下程序的执行结果#includeclass Sample int x,y; public: Sample()x=y=0; Sample(int i,int j)x=i;y=j; void copy(Sample &s); void setxy(int i,int j)x=i;y=j;void print()coutx=x,y= y endl;void Sample:copy(Sample &s) x=s.x;y=s.y;void func(Sample s1,Sample &s2) s1.setxy(10,20); s2.setxy(30,40); void main( ) Sample p(1,2),q; q.copy(p); func(p,q); p.print(); q.print();继承派生1#include class A1 int a1;public:A1(int i) a1 = i;coutConstructor A1.a1endl;void Print( )couta1endl; ;class A2 int a2;public:A2(int j) a2 = j;coutConstructor A2.a2endl;void Print( )couta2endl;class A3int a3;public:A3(int k) a3 = k;coutConstructor A3.a3endl;int Geta3( )return a3;class D:public A1, public A2int d; A3 aa3;public:D(int i, int j, int k, int l):A2(i), A1(j), aa3(k)d = l;coutConstructor D.dendl;void Print( )A1:Print( );A2:Print( );coutd.aa3.Geta3( )endl;void main()D dd(6, 7, 8, 9);dd.Print( );A2 aa2(4);aa2 = dd;aa2.Print( );A1 aa1(2);aa1 = dd;aa1.Print( );2#includeclass Bpublic: void Print()coutbendl;protected: void Setb(int i)b=i*i;private: int b; ;class D1:public Bpublic: void