【例2.12】重载函数应用举例[1]

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1、重载函数应用举例#includeintadd(intx,inty){intsum;sum=x+y;returnsum;}intadd(intx,inty,intz){intsum;sum=x+y+z;returnsum;}voidmain(){inta,b;a=add(5,10);b=add(5,10,20);cout<<”a=”<#includeclassStudent{public:Stu

2、dent(char*pName="noname",intssId=0){strncpy(name,pName,40);name[39]='';id=ssId;cout<<"Constructingnewstudent"<

3、harname[40];intid;};voidfn(Students){cout<<"Infunctionfn()";//fn函数调用结束时，析构对象s}voidmain(){Studentrandy("Randy",1234);//调用构造函数，创建对象randyStudentwang("wang",5678);//调用构造函数，创建对象wangcout<<"Callingfn()";fn(randy);//调用fn函数，参数传递时调用拷贝构造函数cout<<"Returnedfromfn()";}//主函数调用结束时，先析构对象wang，再析构对象randy程序的运行结果为：

4、ConstructingnewstudentRandyConstructingnewstudentwangCallingfn()ConstructingcopyofRandyInfunctionfn()DestructingcopyofRandyReturnedfromfn()DestructingwangDestructingRandy缺省构造函数#include#includeusingnamespacestd;classStudent{public:Student(char*pName){cout<<"calloneparameterconstruct

5、or"<

6、orthenameisJenny友元函数的定义和使用#definestrmax32#include#includeclassmyclass{intx,y;char*string;public:myclass(intvx,intvy,char*str);friendintsum(myclassc1);//友元函数的声明friendintstrlength(myclassc1);//友元函数的声明friendvoidprint(myclassc1);//友元函数的声明};myclass::myclass(intvx,intvy,char*str){x=v

7、x;y=vy;string=newchar[strmax];strcpy(string,str);}intsum(myclassc1)//友元函数的定义{returnc1.x+c1.y;}intstrlength(myclassc1)//友元函数的定义{returnstrlen(c1.string);}voidprint(myclassc1)//友元函数的定义{cout<<"x="<