C++_编程题库

【第1页共61页】31．定义盒子Box类，要求具有以下成员：长、宽、高分别为x,y,z，可设置盒子形状；可计算盒子体积；可计算盒子的表面积。#includeiostream#includeiostreamusingnamespacestd;classBox{public:intweight;intlength;inthight;voidbox_shape(intw,intl,inth);intbox_volume(intw,intl,inth);intbox_area(intw,intl,inth);};intmain(){Boxmybox;coutPleaseEnterweightandlengthandhight:;cinmybox.weightmybox.lengthmybox.hight;intbox_v,box_a;mybox.box_shape(mybox.weight,mybox.length,mybox.hight);box_v=mybox.box_volume(mybox.weight,mybox.length,mybox.hight);coutThisbox'svolume=box_vendl;box_a=mybox.box_area(mybox.weight,mybox.length,mybox.hight);coutThisbox'sarea=box_aendl;}voidBox::box_shape(intw,intl,inth){if(w==l&&l==h)coutThisisaCube!endl;elsecoutThisisacuboid!endl;}intBox::box_volume(intw,intl,inth){returnw*l*h;}intBox::box_area(intw,intl,inth){return2*w*l+2*l*h+2*w*h;}【第2页共61页】32．有两个长方柱，其长、宽、高分别为：（1）30，20，10；（2）12，10，20。分别求他们的体积。编一个基于对象的程序，在类中用带参数的构造函数。#includeiostreamclassBox{private:intlength;intweight;inthight;public:Box(int,int,int);intvolume();};intmain(){usingnamespacestd;Boxmybox1(30,20,10);coutThefirstBox'svolume=mybox1.volume()endl;Boxmybox2(12,10,30);coutThesecondBox'svolume=mybox2.volume()endl;return0;}Box::Box(intl,intw,inth){length=l;weight=w;hight=h;}intBox::volume(){return(hight*weight*length);}【第3页共61页】33．有两个长方柱，其长、宽、高分别为：（1）12，20，25；（2）10，30，20。分别求他们的体积。编一个基于对象的程序，且定义两个构造函数，其中一个有参数，一个无参数。#includeiostreamclassBox{private:intlength;intwight;intheight;public:Box();Box(int,int,int);intvolume();};intmain(){usingnamespacestd;Boxmybox1;coutThefirstbox'svolume=mybox1.volume()endl;Boxmybox2(10,30,20);coutThesecondbox'svolume=mybox2.volume()endl;return0;}Box::Box(){length=12;wight=20;height=25;}Box::Box(intl,intw,inth){length=l;wight=w;height=h;}intBox::volume(){returnlength*wight*height;}34．声明一个类模板，利用它分别实现两个整数、浮点数和字符的比较，求出大数和小数。【第4页共61页】#includeiostreamusingnamespacestd;templateclassnumtypeclassCompare{public:Compare(numtypea,numtypeb){x=a;y=b;}numtypemax(){return(xy)?x:y;}numtypemin(){return(xy)?x:y;}private:numtypex,y;};intmain(){Compareintcmp1(3,4);coutcmp1.max()istheMaximumoftwointedernumbers.endl;coutcmp1.min()istheMinimumoftwointedernumbers.endlendl;Comparefloatcmp2(45.78,93.6);coutcmp2.max()istheMaximumoftwofloatnumbers.endl;coutcmp2.min()istheMinimumoftwofloatnumbers.endlendl;Comparecharcmp3('a','A');coutcmp3.max()istheMaximumoftwocharacters.endl;coutcmp3.min()istheMinimumoftwocharacters.endl;return0;}35．建立一个对象数组，内放5个学生的数据（学号、成绩），用指针指向数组首元素，输出第1，3，5个学生的数据。初值自拟。#includeiostreamusingnamespacestd;classStudent{public:Student(intn,ints):num(n),score(s){}voiddisplay(){coutnumscoreendl;}private:intnum;intscore;};intmain(){Studentstud[5]={Student(01,70),Student(02,71),Student(03,72),Student(04,73),Student(05,74)};Student*p=stud;for(inti=0;i=2;p=p+1,i++)【第5页共61页】p-display();return0;}36．建立一个对象数组，内放5个学生的数据（学号、成绩），设立一个函数max，用指向对象的指针作函数参数，在max函数中找出5个学生中成绩最高者，并输出其学号。初值自拟。#includeiostreamusingnamespacestd;classStudent{public:Student(intn,ints):num(n),score(s){}intnum;intscore;};intmain(){Studentstud[5]={Student(01,70),Student(02,71),Student(03,72),Student(04,73),Student(05,74)};voidmax(Student*);Student*p=&stud[0];max(p);return0;}voidmax(Student*arr){floatmax_score=arr[0].score;for(inti=0;i5;i++)if(max_scorearr[i].score){max_score=arr[i].score;}coutmax_scorearr[i].numendl;}38.定义一个复数类Complex，重载运算符“+”，使之能用于复数的加法运算。将运算符函数重载为非成员、非友元的普通函数。编写程序，求两个复数之和。初值自拟。【第6页共61页】#includeiostreamclassComplex{private:doublereal;doubleimage;public:Complex();Complex(double,double);doubleget_real();doubleget_image();};Complexoperator+(Complex&,Complex&);intmain(){Complexs1(3,4);Complexs2(5,-10);Complexc3;c3=s1+s2;std::couts1+s2=;std::cout(c3.get_real(),c3.get_image()i)std::endl;//Complexs1(3,4);//std::couts1.get_real()std::endl;return0;}Complex::Complex(doubler,doublei){real=r;image=i;}Complex::Complex(){real=0;image=0;}doubleComplex::get_real()【第7页共61页】{returnreal;}doubleComplex::get_image(){returnimage;}Complexoperator+(Complex&s1,Complex&s2){Complexc(s1.get_real()+s2.get_real(),s1.get_image()+s2.get_image());returnc;}39．定义一个复数类Complex，重载运算符“＋”，“—”，使之能用于复数的加，减运算，运算符重载函数作为Complex类的成员函数。编程序，分别求出两个复数之和，差。初值自拟。#includeiostreamclassComplex{private:doublereal;doubleimage;public:Complex();Complex(double,double);Complexoperator+(Complex&);Complexoperator-(Complex&);voiddisplay();};intmain(){Complexs1(3,4),s2(5,6),c;c=s1+s2;c.display();c=s1-s2;c.display();return0;}【第8页共61页】Complex::Complex(){real=0;image=0;}Complex::Complex(doubler,doublei){real=r;image=i;}ComplexComplex::operator+(Complex&s1){Complexc;c.real=s1.real+real;c.image=s1.image+image;returnc;}ComplexComplex::operator-(Complex&s1){Complexc;c.real=real-s1.real;c.image=image-s1.image;returnc;}voidComplex::display(){usingnamespacestd;coutrealimageendl;}40.定义一个复数类Complex，重载运算符“＋”，使之能用于复数的加法运算。参加运算的两个运算量可以都是类对象，也可以其中有一个是整数，顺序任意。例如：c1+c2，i+c1，c1+i均合法（设i为整数，c1，c2为复数）。编程序，分别求两个复数之和、整数和复数之和。初值自