小程序练习代码

小程序练习代码：定义重载函数max3用于计算三个数的最大值（参数类型分别为int和double）#include<iostream>usingnamespacestd;intMAX3(inta,intb,intc){ intmax; max=a>b?a:b; returnmax>c?max:c;}doubleMAX3(doublea,doubleb,doublec){ doublemax; max=a>b?a:b; returnmax>c?max:c;}intmain(){ into,p,q; cout<<"Enterthreenumber:"<<endl; cin>>o>>p>>q; cout<<"thebiggestnumberis:"<<MAX3(o,p,q)<<endl; doublex,y,z; cout<<"Enterthreenumber"<<endl; cin>>x>>y>>z; cout<<"thebiggestnumberis:"<<MAX3(x,y,z)<<endl; return0;}定义point类，数据成员包括x,y，成员函数包括构造函数，拷贝构造函数和析构函数，以及setx，getx，sety，gety四个属性函数。定义line类，端点由两个point类的对象组成，包括构造函数，析构函数以及计算线段长度的函数getlength。在main函数中，定义line的对象，并输出其长度#include<iostream>#include<cmath>usingnamespacestd;classpoint{private: intx,y;public: point(intxx=0,intyy=0):x(xx),y(yy){} point(point&p); intsetx(){} intgetx() { returnx; } intsety(){} intgety() { returny; } ~point(){}};point::point(point&p){ x=p.x; y=p.y;}classLine{private: pointp1,p2; doublelen;public: Line(pointxp1,pointxp2); Line(Line&l); doublegetlength() { returnlen; } ~Line(){}};Line::Line(pointxp1,pointxp2):p1(xp1),p2(xp2){ cout<<"callingtheconstructor..."<<endl; doublex=static_cast<double>(p1.getx()-p2.getx()); doubley=static_cast<double>(p1.gety()-p2.gety()); len=sqrt(x*x+y*y);}Line::Line(Line&l):p1(l.p1),p2(l.p2){ len=l.len;}intmain(){ pointmyp1(1,1),myp2(4,5); Lineline(myp1,myp2); Lineline2(line); cout<<"thelengthofthelineis:"; cout<<line.getlength()<<endl; cout<<"thelengthoftheline2is:"; cout<<line2.getlength()<<endl; return0;}定义student类，数据成员包括姓名name和成绩score，成员函数包括构造函数，拷贝构造函数和析构函数。定义函数voidhighestscore(students[]),输出分数最高的学生姓名和分数。在main函数中定义students[N]，调用highestscore函数,输出分数最高的学生姓名和分数#include<iostream>#include<string>usingnamespacestd;constintN=5;classstudent{private: stringname; doublescore;public: student(stringn="zhangsan",doubles=0):name(n),score(s){} student(student&s) { this->name=; this->score=s.score; } ~student(){} friendvoidhighestscore(students[]);};voidhighestscore(students[]){ students0; for(inti=0;i<N;i++) { if(s0.score<s[i].score) s0=s[i]; } cout<<"thestudentwhogetthehighestscoreis:"<<<<endl; cout<<"thehighestscoreis:"<<s0.score<<endl;}intmain(){ students[N]= { student("studentone",10), student("studenttwo",30), student("studnetthree",90), student("studentfour",50), student("studentfive",70) }; highestscore(s); return0;}设计一个书类，能够保存书名、定价，所有书的本数和总价。（将书名和定价设计为普通数据成员；将书的本数和总价设计为静态数据成员）#include<iostream>#include<string>usingnamespacestd;classbook{private: stringbookname; doubleprice; staticintbooknum; staticdoubleallprice;public: book(stringbna="C++",doublep=0):bookname(bna),price(p) { booknum++; allprice=allprice+price; } ~book(){} voidBookname() { cout<<"thebooknameis:"<<bookname<<endl; cout<<"thepriceis:"<<price<<endl; } voidshowbook() { cout<<"thebooknumberis:"<<booknum<<endl; cout<<"allthebookpriceis:"<<allprice<<endl; }};intbook::booknum=0;doublebook::allprice=0;voidmain(){ books1("ChineseBook",95);s1.Bookname(); books2("C++Book",59); s2.Bookname(); s2.showbook();}定义point类，数据成员包括x,y，成员函数包括构造函数，拷贝构造函数和析构函数，以及setx，getx，sety，gety四个属性函数。在main函数中，用new和delete分配和释放N个point的数组。（N是const常量，N=10）#include<iostream>usingnamespacestd;constN=10;classpoint{private: intx,y;public: point(intxx=0,intyy=0):x(xx),y(yy){} point(constpoint&pt) { x=pt.x; y=pt.y; } voidsetx(intxx) { setx(xx); } intgetx() { returnx; } voidsety(intyy) { sety(yy); } intgety() { returny; } voidshowpoint() { cout<<"x="<<x<<",y="<<y<<endl; } ~point(){}};voidmain(){ point*pt=newpoint[N]; (*pt).setx(1); (*pt).sety(1); (*pt).showpoint(); delete[]pt;}定义一个point类，包含私有数据成员x，y，成员函数包括无参构造函数，带参构造函数，set和get属性函数。定义circle类，从point类公有派生，增加数据成员半径r，成员函数包括无参构造函数，带参构造函数，计算面积函数getarea。在main函数中定义一个circle的对象，并计算其面积#include<iostream>usingnamespacestd;#definepi3.14classpoint{private: doublex,y;public: point(){} point(doublexx,doubleyy):x(xx),y(yy){} voidsetx(doublexx) { setx(xx); } intgetx() { returnx; } voidsety(doubleyy) { sety(yy); } intgety() { returny; }};classcircle:publicpoint{private: doubler;public: circle(){} circle(doublexx,doubleyy,doublerr):point(xx,yy),r(rr){} voidgetarea() { doublearea; area=pi*r*r; cout<<"theareais:"<<area<<endl; }};voidmain(){ circlec(3,4,5); c.getarea();}定义vehicle类，数据成员包括私有的weight，公有的构造函数，析构函数和输出函数dispaly；从vehicle类公有派生car类，增加数据成员载人数personnum，公有的构造函数,析构函数和输出display；从vehicle类公有派生truck类，增加数据成员载货量laod,公有的构造函数，析构函数和输出函数display；从car类和truck类共同公有派生出pickup类，包括公有的构造函数和输出函数。在main函数中，定义pickup类对象，并输出其基本信息#include<iostream>usingnamespacestd;classvehicle{private: intweight;public: vehicle(intw):weight(w){} voiddisplay() { cout<<"theweightis:"<<weight<<endl; } ~vehicle(){}};classcar:virtualpublicvehicle{private: intpersonnum;public: car(intw,intp):vehicle(w),personnum(p){} voiddisplay() { cout<<"thrpersonnumis:"<<personnum<<endl; } ~car(){}};classtruck:virtualpublicvehicle{private: intlaod;public: truck(intw,intl):vehicle(w),laod(l){} voiddisplay() { cout<<"thelaodis:"<<laod<<endl; } ~truck(){}};classpickup:publiccar,publictruck{public: pickup(intw1,intw2,intv,intp,intl):vehicle(v),car(w1,p),truck(w2,l){} voiddisplay() { vehicle::display(); car::display(); truck::display(); }};voidmain(){ pickupP(10,20,30,40,50); P.display();}定义一个计数器类counter，具备自增，自减功能（前后缀）；输入输出>>,<<功能。在main函数里测试该类#include<iostream.h>classcounter{private: intn;public: counter(){} counter(intnn):n(nn){} counter&operator++(); counter&operator--(); counteroperator++(int); counteroperator--(int); friendostream&operator<<(ostream&os,constcounter&c); friendistream&operator>>(istream&is,constcounter&c);};counter&counter::operator++(){ n++; return*this;}counter&counter::operator--(){ n--; return*this;}countercounter::operator++(int){ counterc=*this; ++(*this); returnc;}countercounter::operator--(int){ counterc=*this; --(*this); returnc;}ostream&operator<<(ostream&os,constcounter&c){ os<<c.n; returnos;}istream&operator>>(istream&is,constcounter&c){ is>>c.n; returnis;}voidmain(){ counterc(5); c++; cout<<c<<endl;}定义一个抽象类shape，包括公有的计算面积area函数，计算体积volume函数，输出基本信息函数printinfo（三个函数均为纯虚函数）。从shape公有派生point类，增加私有数据成员x,y坐标，以及构造函数，析构函数。从point公有派生circle类，增加私有数据成员半径r，以及构造函数，析构函数。从circle公有派生cylinder类，增加私有数据成员高度h，以及构造函数，析构函数。（在定义三个派生类的过程中，自己考虑需要重定义哪个虚函数）。在main函数中，定义shape类的指针，指向派生类的对象，输出三类对象的基本信息，面积，体积；（将shape指针改为引用再尝试）#include<iostream>usingnamespacestd;classshape{public: virtualdoublearea()=0; virtualdoublevolume()=0; virtualvoidprintinfo()=0;};classpoint:publicshape{private: intx; inty;public: point(intx,inty):x(x),y(y){} doublearea() { return0; } doublevolume() { return0; } voidprintinfo() { cout<<"point:("<<x<<","<<y<<")"<<endl; } ~point(){}};classcircle:publicpoint{private: intr;public: circle(intx,inty,intr):point(x,y),r(r){} doublearea() { return(3.1415*r*r); } voidprintinfo() { cout<<"r="<<r<<endl; cout<<"area="<<area()<<endl; } ~circle(){}};classcylinder:publiccircle{private: inth;public: cylinder(intx,inty,intr,inth):circle(x,y,r),h(h){} doublevolume() { returncircle::area()*h; } voidprintinfo() { cout<<"h="<<h<<endl; cout<<"volume="<<volume()<<endl; } ~cylinder(){}};voidfun(shape*p){ p->printinfo();}intmain(){ pointp(1,1); circlec(1,1,2); cylinderC(1,1,2,2); fun(&p); fun(&c); fun(&C); return0;}设计一个堆栈的类模板Stack，在模板中用类型参数T表示栈中存放的数据，用非类型参数MAXSIZE代表栈的大小#include<iostream>usingnamespacestd;constmaxsize=5;template<typenameT>classstack{private: Ts[maxsize]; inttop;public: stack() { top=0; } voidpush(Te) {if(maxsize==top) { cout<<"栈满"<<endl; return; } s[top]=e; top++; } Tpop() { if(top==0) { cout<<"栈空"<<endl; return-1; } top--; returns[top]; }};voidmain(){ stack<int>s; s.push(3); cout<<s.pop();}定义学生类数组，有N个人（N=5），包括姓名和语数外三名课的成