C++ 6-11章课后作业参考答案.doc

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1、第六章类和对象1．给出以下程序的执行结果题目见《C++语言程序设计》9.9—9.21（P212）和《C++程序设计教程》6.2-6.4（P115）答案：《C++语言程序设计》9.9运行结果：String9.10运行结果：n=6n=6n=69.11运行结果：n=10,k=3n=20,k=3n=30,k=39.13运行结果：n=2n=39.14运行结果：Constructor,i=0,Destructor9.15运行结果：Constructor1Constructor2i=0i=10DestructorDestructor9.16

2、运行结果：AConstructorBConstructorValue=0BDestructorADestructor9.17运行结果：A=7,b=89.18运行结果：5679.19运行结果：Constructor1Constructor1Constructor1Constructor1DestructorConstructor2DestructorConstructor3Destructorx=0,y=0x=5,y=0x=2,y=3DestructorDestructorDestructor9.20运行结果：(1,2,3):c

3、ount=2(2,3,4):count=29.21运行结果：A:ConstructorB:Constructorn=3m=2B:DestructorA:Destructor2．编写一个程序，输入若干个学生的英语和数学成绩，求出总分，并按总分从高到低排序，最后输出结果。#include"iostream"#include"string"#include"iomanip"usingnamespacestd;classStudent{public:char*name;inteng,math,sum;Student();voidins

4、core();voiddisplay();~Student();};Student::Student(){name=newchar[10];}voidStudent::inscore(){cout<<"姓名：";cin>>name;cout<<"英语：";cin>>eng;cout<<"数学：";cin>>math;sum=eng+math;}voidStudent::display(){cout<

5、;}Student::~Student(){delete[]name;}voidequal(Student&a,Student&b){strcpy(a.name,b.name);a.eng=b.eng;a.math=b.math;a.sum=b.sum;}voidsort(Student*p,intn){inti,j,exchange;Studenttmp;for(i=0;i=i;j--)if(p[j+1].sum>p[j].sum){equal(tmp,p[j

6、+1]);equal(p[j+1],p[j]);equal(p[j],tmp);exchange=1;}if(!exchange)break;}}voidmain(){intn,i;Student*p;cout<<"请输入学生个数：";cin>>n;p=newStudent[n];for(i=0;i

7、)p[i].display();system("pause");}3．设计一个立方体类Box，它能提供立方体的体积和表面积。#include"iostream"usingnamespacestd;classBox{floata;floatvolume;floatarea;public:Box(){}Box(floatr){a=r;}voidseta(floatr){a=r;}voidgetvolume(){volume=a*a*a;}voidgetarea(){area=6*a*a;}voiddisp(){cout<<"体积：

8、"<";obj1.disp();obj2.