北邮信通C++上机实验第七章

第七章实验题一．基础题1.#include <iostream>using namespace std;class CSample {double a;CSample(){a=2.5;};public:CSample(int val);~CSample(); };2.#include <iostream>using namespace std;class cube{public:cube();//构造函数~cube();//析构函数int volume(); //定义整形函数private:int height, width, depth;//定义私有数据成员};cube::cube(){height = 100;depth = 4;width = 2;cout<<"Constructor called."<<endl;}cube::~cube(){cout << "Destructor called." << endl;system("pause");}int cube::volume(){return height*width*depth;}void main(){cube cubeone; //定义对象cout<<"立方体的体积为："<<cubeone.volume()<<endl;system("pause");}3.#include <iostream>using namespace std;class CCounter{int value;public:CCounter(){cout << "CCounter Constructor1" << endl;value = 0;}CCounter(int val){cout << "CCounter Constructor2" << endl;value = val;}~CCounter(){cout << "CCounter Destructor" << endl;system("pause");}};class CExample{int value;public:CCounter car;CExample(){cout << "CExample Constructor1" << endl;value = 0;}CExample(int val){cout << "CExample Constructor2" << endl;value = val;}~CExample(){cout << "CExample Destructor" << endl;system("pause");}void Display() { cout << "value=" << value << endl; } };void main(){CExample obj(350);obj.Display();system("pause");}//调用顺序：CCounter()-CExample(int val)-~CExample()-~CCounter()4.#include <iostream>using namespace std;class Point{protected:int x;public:int Getx(){ return x; }int Y;void init(int a, int b){ x = a; Y = b; } int Gety(){ return Y; }void Setx(int a){ x = a; }void Sety(int b){ Y = b; }};void main(){Point A, B;A.init(25, 27);B.init(29, 31);cout << "A.x=" << A.Getx() << endl;cout << "B.x=" << B.Getx() << endl;cout << "A.Y=" << A.Y << endl;cout << "A.y=" << A.Gety() << endl;cout << "B.y=" << B.Y << endl;cout << "B.y=" << B.Gety() << endl;system("pause");}5.#include <iostream>using namespace std;class base{private:int i;static int k; //定义静态变量k public:base() { i = 0; k++; } //定义构造函数void Display();};void base::Display(){k = k + 10;i++;cout << "i=" << i << ",k=" << k << endl; }int base::k = 0; //初始化k的值void main(){base a, b;a.Display();b.Display();system("pause");}运行结果为：i=1;k=12i=1;k=22二．编程题1.{if (x > 0){cout << "It's a positive number" << endl;positive++;}else if (x == 0){zero++;cout << "It's zero" << endl;}else{negative++;cout << "It's a negative number" << endl;}}int num::positive = 0; int num::negative = 0; int num::zero = 0; void main(){int n;while (cin >> n){num test(n);test.decision();test.print();}system("pause");}2.#include <iostream>using namespace std;class dianqi{public:void getprice(int x , int y, int z ) {colorcast = x;ridge = y;washer = z;};void total(int a , int b , int c ){int t = a*colorcast + b*ridge + c*washer;cout << t << endl;};private:int colorcast;int ridge;int washer;};void main(){dianqi dian;dian.getprice(4200, 2800, 1500);cout << "请分别输入彩电，冰箱，洗衣机的销售数量：";int a = 0, b = 0, c = 0;cin >> a;cout << " ";cin >> b;cout << " ";cin >> c;cout << endl;cout << "总营业额为：";dian.total(a, b, c);system("pause");}3.#include<iostream>#include<string>using namespace std;class car{public:void disp_parameters(){cout << "型号： " << type<< endl;cout << "颜色： " << colour << endl;cout << "车门数：" << door << endl;cout << "座位数：" << seat << endl;cout << "轴距： " <<distance << endl;}void change(string a, char b, int c, int d, int e) {type = a;colour = b;door = c;seat = d;distance = e;}private:string type;char colour;int door;int seat;int distance;};void main(){car gundam;gundam.change("Double O GUNDAM", 'b', 1, 5, 6);gundam.disp_parameters();system("pause");}4.#include <iostream>using namespace std;class student{public:int num;char name[20];char sex;int age;};void main(){student stu[5];student temp;for (int i = 0; i<5; i++){cout << "输入第" << i + 1 << "位学生的学号：";cin >> stu[i].num;cout << "输入第" << i + 1 << "位学生的：";cin >> stu[i].name;cout << "输入第" << i + 1 << "位学生的性别：";cin >> stu[i].sex;cout << "输入第" << i + 1 << "位学生的年龄：";cin >> stu[i].age;}for (int a = 1; a < 5; a++){for (int b =0 ; b < 5-a; b++){if (stu[b].age<stu[b + 1].age){temp.age = stu[b + 1].age;stu[b + 1].age = stu[b].age;stu[b].age = temp.age;}}}for (int i = 0; i<5; i++)cout << "num:" << stu[i].num << " name:" << stu[i].name << " sex:" << stu[i].sex << " age:" << stu[i].age << endl;system("pause");}5.#include <iostream>using namespace std;class ATM{public:void s_balance(void){cout << "The balance is " << balance << endl;}void deposit(float a){balance += a;}void withdraw(float a){balance -= a;}int checking(int a){if (key == a)return 1;elsereturn 0;}private:int key = 328;static float balance; };float ATM::balance = 0.0f; void main(){ATM sys1;int k,m;float num;cout << "Please input the key: ";cin >> k;if (sys1.checking(k) != 1)cout << "Error" << endl;else{cout << "Please choose the function:" << endl << "(1) Depositing money" << endl <<"(2) Withdrawing money" << endl <<"(3) Check the balance" << endl <<"(4) Return to the main interface"<<endl;while (cin >> m){switch (m){case 1:cout << "Please input how much you want to deposit: ";cin >> num;sys1.deposit(num);cout << "You have deposited " << num << endl;sys1.s_balance();cout << "Please choose the function:" << endl << "(1) Depositing money" << endl <<"(2) Withdrawing money" << endl <<"(3) Check the balance" << endl << "(4) Return to the main interface" << endl;break;case 2:cout << "Please input how much you want to withdraw: ";cin >> num;sys1.withdraw(num);cout << "You have withdrawed " << num << endl;sys1.s_balance();cout << "Please choose the function:" << endl << "(1) Depositing money" << endl <<"(2) Withdrawing money" << endl <<"(3) Check the balance" << endl << "(4) Return to the main interface" << endl;break;case 3:sys1.s_balance();cout << "Please choose the function:" << endl << "(1) Depositing money" << endl <<"(2) Withdrawing money" << endl <<"(3) Check the balance" << endl << "(4) Return to the main interface" << endl;break;case 4:cout << "Please choose the function:" << endl << "(1) Depositing money" << endl <<"(2) Withdrawing money" << endl <<"(3) Check the balance" << endl;break;default:cout << "Error1" << endl;break;}}}system("pause");}6.#include <iostream> #include<string> using namespace std; class student{public:friend void sort(student &a, student &b, student &temp);void change(string a, int b, float c){name=a;num = b;score = c;}float show(){return score;}private:int num;string name;float score;};void sort(student &a, student &b,student &temp){if (a.score < b.score){temp = a;a= b;b = temp;}}void main(){student stu[5];student temp;string q=" ";int w = 0;float e=0.0f;for (int i = 0; i<5; i++){cout << "输入第" << i + 1 << "位学生的,学号,成绩："<<endl;cout << " ：";cin >> q;cout << " 学号：";cin >> w;cout << " 成绩：";cin >> e;stu[i].change(q, w, e);cout << endl;}for (int i = 1; i<5; i++){for (int j = 0; j<(5 - i); j++){sort(stu[j], stu[j + 1], temp);}}cout << "最高分" << stu[0].show() << endl;cout << "最低分" << stu[4].show() << endl;system("pause");}。