《C++面向對象程序設計》答案-第三章-譚浩強-清華大學出版社

2:#include 〈iostream〉usingnamespacestd；classDate{public:Date(int,int，int);Date(int,int)；Date(int)；Date()；voiddisplay()；private：intmonth;intday;intyear；};Date：:Date(intm，intd,inty)：month(m)，day(d),year(y){}Date::Date(intm，intd)：month(m)，day(d){year=2005;}Date：:Date(intm)：month(m){day=1;year=2005;}Date：：Date(){month=1;day=1；year=2005;}voidDate：:display(){cout＜〈month〈〈"/"〈＜day〈＜"/"＜＜year〈＜endl；}intmain(){Dated1(10,13,2005)；Dated2(12，30)；Dated3(10);Dated4;d1.display()；d2。display()；d3.display();d4。display();return0；}3：#include〈iostream>usingnamespacestd;classDate{public:Date(int=1,int=1,int=2005);voiddisplay()；private：intmonth；intday；intyear;}；Date::Date(intm,intd，inty):month(m),day(d),year(y){}voidDate：：display(){cout〈〈month<<”/”<<day<〈"/"<〈year〈〈endl；}intmain(){Dated1(10,13,2005);Dated2(12，30);Dated3(10);Dated4；d1.display();d2.display()；d3。display()；d4。display();return0;}4:＃include〈iostream>usingnamespacestd；classStudent{public:Student(intn,floats)：num(n),score(s){}voiddisplay()；private:intnum；}}}}floatscore；}；voidStudent：:display(){cout＜＜num〈＜""〈＜score＜〈endl；}intmain(){Studentstud[5]={Student(101,78.5),Student(102,85。5),Student(103,98。5),Student(104,100.0),Student(105,95.5)};Student＊p=stud；for(inti=0;i〈=2;p=p+2,i++)p-＞display();return0；}5：#include＜iostream〉usingnamespacestd；classStudent{public:Student(intn,floats):num(n),score(s){}intnum；floatscore；}；voidmain(){Studentstud[5]={Student(101,78。5),Student(102,85.5),Student(103,98.5),Student(104,100。0),Student(105,95.5)}；voidmax(Student＊);Student*p=＆stud[0]；max(p);}voidmax(Student＊arr){floatmax_score=arr[0].score;intk=0；for(inti=1；i〈5；i++)if(arr[i].score＞max_score){max_score=arr[i]。score；k=i;}cout＜〈arr[k]。num〈＜””〈＜max_score〈〈endl;6：＃include 〈iostream〉usingnamespacestd;classStudent{public:Student(intn,floats)：num(n),score(s){}voidchange(intn,floats){num=n;score=s;}voiddisplay(){cout<〈num〈<""〈〈score〈<endl;}private：intnum；floatscore;};intmain(){Studentstud(101,78。5)；stud.display()；stud。change(101,80。5)；stud。display()；return0；}7：解法一#include〈iostream>usingnamespacestd；classStudent{public：Student(intn，floats):num(n),score(s){}voidchange(intn,floats) {num=n;score=s；}voiddisplay(){cout<<num<〈"”〈<score<<endl；}〃可改為:voiddisplay()const{cout〈<num<<""〈<score〈<endl;}private:intnum；floatscore；};intmain(){constStudentstud(101,78。5);stud.display();//stud。change(101,80。5);studodisplay();return0;解法二:#include〈iostream〉usingnamespacestd;classStudent{public:Student(intn,floats):num(n),score(s){}voidchange(intn,floats)const{num=n;score=s；}voiddisplay()const{cout<〈num<〈"”〈〈score<〈endl;}private:mutableintnum;mutablefloatscore；}；intmain(){constStudentstud(101,78.5);stud。display()；stud。change(101,80.5);stud.display()；return0;}解法三：#include<iostream〉usingnamespacestd;classStudent{public:Student(intn,floats):num(n),score(s){}voidchange(intn,floats){num=n；score=s；}voiddisplay(){cout〈〈num<<"”〈<score<<endl；}private:intnum；floatscore；}；intmain(){Studentstud(101,78.5);Student*p=&stud；p—>display()；p->change(101,80.5)；p—>display()；return0;8：＃include<iostream〉usingnamespacestd;classStudent{public:Student(intn，floats):num(n),score(s){}voidchange(intn,floats){num=n;score=s；}voiddisplay(){cout<<num〈〈"”<<score〈<endl;}private：intnum；floatscore；};intmain(){Studentstud(101,78.5);voidfun(Student＆);fun(stud)；return0；}voidfun(Student＆stu){stu。display()；stu。change(101,80.5);stu.display();}9：＃include〈iostream〉usingnamespacestd；classProduct{public:Product(intn,intq,floatp):num(n),quantity(q)，price(p){}；voidtotal()；staticfloataverage();staticvoiddisplay()；private:intnum；intquantity；floatprice;staticfloatdiscount;staticfloatsum；staticintn;};voidProduct::total(){floatrate=1。0;if(quantity>10)rate=0.98＊rate;sum=sum+quantity＊price＊rate＊(1—discount);n=n+quantity；}voidProduct：：display(){cout<〈sum〈<endl；cout〈〈average()<〈endl;}floatProduct：：average(){return(sum/n)；}floatProduct：：discount=0。05；floatProduct：：sum=0；intProduct::n=0；intmain(){ProductProd[3]={Product(101,5,23.5),Product(102,12,24。56),Product(103,100,21。5)}；for(inti=0；i〈3；i++)Prod[i]。total()；Product:：display()；return0;}10:＃include<iostream>usingnamespacestd;classDate；classTime{public:Time(int,int,int);friendvoiddisplay(constDate&,constTime&);private:inthour;intminute；intsec;｝；Time::Time(inth，intm，ints){hour=h;minute=m；sec=s；}classDate{public：Date(int，int,int)；friendvoiddisplay(constDate&,constTime&)；private:intmonth;intday;intyear；}；Date：:Date(intm,intd,inty){month=m;day=d;year=y;}voiddisplay(constDate&d,constTime&t){cout<〈d.month〈〈”/"〈〈d。day<<"/"〈<d。year<<endl;cout〈<t。hour<<”:”<〈t.minute〈〈"："〈<t。sec<〈endl；}intmain(){Timet1(10,13，56);Dated1(12,25,2004)；display(d1,t1);return0；}11：#include<iostream>usingnamespacestd；classTime；classDate{public:Date(int,int,int)；friendTime;private:intmonth；intday;intyear;}；Date:：Date(intm,intd,inty)：month(m),day(d),year(y){}classTime{public:Time(int，int，int);voiddisplay(constDate＆)；private：inthour;intminute;intsec；}；Time：：Time(inth,intm,ints):hour(h),minute(m),sec(s){}voidTime::display(constDate&d){cout〈<d.month〈<"/”<<d。day<〈"/"<〈d.year<〈endl；cout<<hour〈<"：”<<minute〈<”："<<sec<〈endl;}intmain(){Timet1(10，13,56);Dated1(12，25,2004)；t1.display(d1)；return0;}12：＃include<iostream>usingnamespacestd；template〈classnumtype>classCompare{public：Compare(numtypea，numtypeb)；numtypemax();numtypemin();private：numtypex,y;};template〈classnumtype〉Compare〈numtype〉：:Compare(numtypea，numtypeb){x=a；y=b；}template