C++面向对象程序设计实验七多态性

1、要想学习好努力少不了。聡叵Km阻吐哽W回联垛颗拠心凹厶09+OA启4ki-MSBIzz。益M运梓M毁H,;,丰噪耕建同寸“镒撑派毁玄丹彖冈匸噪耕灌同m“镒卿梓Mlax丹彖国唱冬噪耕建！一.cl聲呂雲坐糕揺尿S违怆摧灌！J二皿制体芒e删WM坷软国嵋gvs学长只能帮你到这了xonln.sIEO+meu.sIf卩lIEO+lupDzaoXUIdmouo0XIEOxQIckuooo)+JolFsdoxQIckuouubnmu二三wa二三AHmccUHXHI畧(A14xsDXoIckuouuCM51H.SoHp?七;voidmainOCComplexobj1(100,30);CComplexobj2(2

2、0,30);CComplexobj;obj=objl+obj2;/coutobj.realencil;coutobj.imagendl;问题一：处的运算符重载，为什么该函数的返回值要设计成CComplex类型？答：因为复数相加后仍然是复数，因此要设计成原来的复数类型。问题二：处的运算符重载函数调用就相当于“o可=objl.operatorobj2),”，但是为什么CComplex类中的运算符重载函数只设计了一个参数？答：因为此处调用的函数是成员运算符重载函数，所以形参表中只冇一个参数，它作为运算符右操作数，另一个操作数是当前对象objl.2.理解卜面的程序，并在VC+6.0下运行查看结果，回答

3、程序后面的问题。includeiostieam.himag=0.0;imag=0.0;CComplex(floatx,floaty)real=x;imag=y;CComplexoperator+(CComplex&ol,CComplex&o2)CComplexobj3(objl.real+obj2.real,objl.imag+obj2.imag);rehirnobj3;CComplex&operator+(CComplex&obj)obj.real41;obj.imag41;rehirnobj;voidprintOcoutrealf中imagni,rendl;private:floatrea

4、l;floatimag;CComplex&operator-(CComplex&x)x.real=1;x.imag=1;retiinix;CComplex2.132);CComplexvoidmainOCComplex2.132);CComplex3625)；x州3=o隔古Q眼*弋眼口morcoutefor+,obj3=M;obj3.printQ;+obj3;coutr,after-H-,obj3=;obj3.print0；-obj3;coutMafter-,obj3=H;obj3.print0；CComplexobj4=+obj3;coutrrobj4=M;obj4.print0；问题一：以

5、上程序中的三个运算符重载都有错误，试改正过来，并分析该程序的输出结果。答：1把函数CComplex&operator-(CComplex&x)在类中定义为友元函数这样就可以调用私有成员。达到的目的。CComplexoperator+(CComplex&objl,CComplex&o功2)中把其中一个引用去掉因为这是成员运算符重载函数，只能有一个形参，另一个是当前对象。然后把下一句中的其中一个obj去掉。CComplex&operator-H-(CComplex&obj),单目运算符重载，其成员运算符重载函数没有参数，当前对象是运算的操作数，用this指针返回当前值。国*C:DOCUlEliTS

6、ANDSETTINGSobjl=2.1+3.2ibj2=3.6+2.5ibefor+,obj3=5.7+5.7iafter+,obj3=6.7+6.7iafter-,obj3=5.7+5.7ibj4=6.7+6.7iPressanykeytocontinue.722程序设计1.把721中第一道题的程序改造成采取友元函数重载方式来实现“+”运算符，并采取友元函数重载方式增加前置和后置“+”以及“-”运算符重载，并设计主函数来验证重载运算符的用法。参照课本219页例5.9objl原值：90310.111affterobjl+obj2:real=91109ima9=121after+objl：rea

7、l=90311imas(=112objl+：real=90312,imag=113一一objlobjl+：real=90312,imag=113一一objl：real=90311,imag=112objl：real=90310amag=iiijanykeytocontinue_afterafterafterPress电弋泰iortkclassCComplexpublic:CComplexOreal=0,imag=0,CComplex(intx,mty)real=x,unag=y,fiiendCCoinplexoperator+(CComplexobjl,CComplexobj2),fiiend

8、CCoinplexoperator+(CComplex&),fiiendCCoinplexoperator+(CComplex&,int),/后缀方式fiiendCCoinplexoperator-(CComplex&obj4),fiiendCCoinplexoperator-(CComplex&obj4,int),/后缀方式学长只能帮你到这了要想学习好努力少不了IPUvvmeun二qoVVTH-=VV4noo-1曇二qovvls,-=vv4noo厂+4-二qoJ9uevv4no。+二qo=二qo】puvvmeun二qoVVTHI-=VV4noo-1曇二qovvls,-=vv4noo二qo+g

9、evxno。三qo+4=qoIPUCDvvspun.qovvheu5vv4noo尽jqovvls,-=vv4noo-eiqo+-qoJD右e=vv?oqo+=qouqo-pusvvgeun二qovyyE二qoy迫M二qo.vxnooqoxtdulooo(0二66ocqonoksoou(三0706)二qoXYduIOOO0UT&UIP-OA(寸一qoNosooovJO4EJ9do0-&500寸fqolu2Dr+IeDJ寸qoHWCDJ寸fqo+8elu寸qohpmr寸qo(4ur寸0闵xuIdluooo)+JO4EJ9doxCDIdluooomfqoEaoJbD&=mrqo+-H=emr=qo】

10、eCDJgrqo-HIpoJ-qo(030闵x(DIdluooo)+JO4EI9doxCDIdluooomqoIU2OJ(geun二qo+ODeuncifqo二qo+wejclfqo)竺qoxaldluooo(JqoEdluooo二qoxoldulooo)+JO4e,sdoxCDIdluoooobeulr4m】曇4m要想学习好努力少不了4lnodoSSBOP七(DoedsCDlueuODlnsnAse卩qsolv(Dpnoul#si虫殳氓以旺咲农緊冈#)。超注启迴突制次富怵JMK-孑報卿絲wsdorx(A)怎剧暮吴(X)忑翔逵融赵DK菸VK悴签莒。do汉锻二IPUvvMEUH二qoVVTHI-

11、=VV4noo-IEOJIqovvls,-=vv4noo;二qoJ9uevxno。T二qo=Iqo】puvvEun二qoVVTHI-=VV4noo-1曇二qovvls,-=vv4nooJ二qo;J9uevv4no。二qodlfqo学长只能帮你到这了】Ea卩I匕do+XXdo+.(XXdo.xxdo)4WTOdo(docy4ulodo)-HO4p55do4UIOdo宀lvvx=vvvv-.vvxxy).vxnooodslppiOA0闵4UIOdo)；JOWJSdo4lnodopuecs窈4UIOdo)；JOWJSdo4lnodopuecsOufi84lnodo)+JOWJSdo4lnod。puecsff4lnodo)+JOWJSdo4lnod。puecsfXXCPointoperatoi+b(CPoint&op,int)CPointt(opxx,op.yy),op.xx+,opyypreturnt,CPointoperator-(CPoint&op)CPointt(opxx,op.yy),-op.xx,-opyy,returnt,CPointoperator-(CPoint&op,int)CPointt(opxx,op.yy),op.xx-,op.w-cout横纵坐标都自增后0点坐标：jpointldispO