实验5静态成员友元对象成员

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1、实验五静态成员、友元、对象成员1、实验目的：1)掌握静态数据成员的定义及使用；2)掌握静态成员函数的定义及使用。3)掌握友员函数的定义和使用。4)理解对象成员的概念5)掌握对彖成员的初始化方法2、实验内容：2.1分析下面的程序，指岀程序运行的结果。1)P132习题3.14,3.15,3.20,3.23,3.24,3.25,3.26代码：3.14#includeclassB{public:B(){}B(inti,intj){x=i;y=j；}voidprintb(){cout«x«M/,«y«endl;}private:intx,y

2、;}；classA{public:A(){}A(intI,intj);voidprinta();private:Bc;}；A::A(inti,intj):c(i,j)voidA::printa()(c.printb();}intmain()(Aa(7,8);a.printa();return;}程序运行结果：7,83.15程序代码：#includeclassA{public:voidset(inti.intj){x=i;y=j;}intget_y(){returny;}private:intx,y;};classbox{publi

3、c:voidset(intl,intw.ints.intp){lcngth=l;width=w;label.set(s,p);}intger_area(){returnlength*width;)private:intlength,width;Alabel;};intmain(){boxb;bset(4,6丄20);cout«b.gcr_arca()«cndl;return0;}程序运行结果：243.20程序代码：#includeclassaclass{public:aclass(){total++;)〜aclass(){tota

4、l-;}intgcttotal(){returntotal;}private:staticinttotal;};intaclass::total=0;intmain(){aclassol,o2,o3;cout«ol.gettotal()«,robjectsinexistencen;aclass*p;p=newaclass;if(!p){cout«MAllocationerrorn;return1;}cout«oLgettotal();cout«nobjectsinexistenceafterallocationH;deletep;cout«o

5、l.gettotal();cout«nobjcctsinexistenceafterallocation'n”;return0;程序运行结果：3objectsinexistence4objectsinexistenceafterallocation3objectsinexistenceafterallocation3.24程序代码：#includeclassN{private:intA;staticintB;public:N(inta){A=a;B+=a;}staticvoidfl(Nm);};voidN::fl(Nm){cout

6、«MA=n«m.A«endl;cout«HB=n«B«endl;}intN::B=0;intmain(){NP(5),Q(9);N::fl(P);N::fl(Q);return0;}程序运行结果：A=5B=14A=9B=143.26程序代码:#includeclassM{intA;staticintB;public:M(inta){A=a;B+=a;cout«nConstructingH«endl;}staticvoidfl(Mm);〜M(){cout«,,Destructing,';}}；voidM::fl(Mm){cout

7、«"A="«m.A«endl;cout«"B=M«B«endl;}intM::B=0;intmain(){MP(5),Q(9);M::fl(P);M::fl(Q);return0;}程序运行结果：ConstructingConstructingA=5B=14DestructingA=9B=14DestructingDestructingDestructing#includeclassSample{inta.b;staticintc;public:Sample(){a=b=O;C++；}voidshow(){cout«"a=,,«a

8、«,；«"b=,'«b«7«"c=,,«c«endl;}}；intSample: