C++复习题练习.docxVIP

编写一个类LEI，打印其私有成员变量a的值，并测试该类。#includeiostreamusing namespace std;class LEI{public:LEI(int i){a=i;}void get(){coutaendl;}private:int a;};void main(){LEI A(10);A.get();}用面向对象的方法完成对三个数从大到小的排序并输出，并测试该类。#includeiostreamusing namespace std;class Sort{public:Sort(){};Sort(int i,int j,int k){a=i;b=j;c=k;}void max(int a,int b,int c){ if(a=bb=c)coutabcendl;if(accb)coutacbendl;if(bcca)coutbcaendl;if(baac)coutbacendl;if(caab)coutcabendl;else coutcbaendl;}private:int a,b,c;};void main(){Sort B;B.max(3,4,5);}定义类lei，完成一个整形数的输入和输出，并测试该类。#includeiostreamusing namespace std;class IO{public:IO(){};void input(){cina;}void output(){coutaendl;}private:int a;};void main(){IO A;A.input();A.output();}用面向对象的方法，完成圆类的定义#includeiostreamusing namespace std;class Circle{public:Circle(double i){r=i;}void Printf(){cout3.14*r*rendl;}private:double r;}; //下面为数据测试，本题不需要void main(){Circle B(4.0);B.Printf();}从键盘上输入一个3*3的整数矩阵，求其各行的平均值并输出，输出时保留位小数。#includeiostream#includeiomanip//小数定义文件using namespace std;int main(){int a[3][3], i, j;double ave, b[3];for(i=0; i3; ++i){for(j=0; j3; ++j){cina[i][j];}ave=(a[i][0]+a[i][1]+a[i][2])/3.0;b[i]=ave;}for(i=0; i3; i++)coutsetprecision(3)fixedb[i]endl;return 0;}编一个程序计算球体、正方体和圆柱体的体积。要求：（1）抽象出一个公共基类Cube为抽象类，在其中定义一个公共的数据成员radius，此数值可以作为球体的半径和圆柱体底面圆半径；定义对radius进行读写的设置函数和获取函数，再定义求体积的纯虚函数volume和显示半径的虚函数print；（2）由Cube派生出球体类Sphere，其中有求体积的实际定义；（3）从Cube派生出square类，新定义length，并可以对其进行读写，再定义volume和print函数；（3）在测试程序中分别创建一个Sphere类、square和一个Cylinder类的对象，通过调用相关成员函数显示其数据成员和体积信息。#includeiostreamusing namespace std;class Cube{public:Cube(){};Cube(double i){r=i;cout半径为：rendl;}private:double r;};class Sphere:public Cube{public:Sphere(){};Sphere(double i):Cube(i){r=i;}void volume(){cout球体的体积为：(4*3.14*r*r*r)/3.0endl;}private:double r;};class square:public Cube{public:square(){};square(double i):Cube(i){length=i;}void volume(){ V=length*length*length;}void printf(){cout正方体的体积为：Vendl;}private:double length,V;};class Cylinder:public Cube{public:Cylinder(double i):C