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实验3

时间：2024-11-06 22:19:04浏览次数：1  
标签：std const string int void 实验 cout 

#pragma once

#include <iostream>
#include <string>

using std::string;
using std::cout;

// 按钮类
class Button {
public:
    Button(const string &text);
    string get_label() const;
    void click();

private:
    string label;
};

Button::Button(const string &text): label{text} {
}

inline string Button::get_label() const {
    return label;
}

void Button::click() {
    cout << "Button '" << label << "' clicked\n";
}


#pragma once
#include "button.hpp"
#include <vector>
#include <iostream>

using std::vector;
using std::cout;
using std::endl;

// 窗口类
class Window{
public:
    Window(const string &win_title);
    void display() const;
    void close();
    void add_button(const string &label);

private:
    string title;
    vector<Button> buttons;
};

Window::Window(const string &win_title): title{win_title} {
    buttons.push_back(Button("close"));
}

inline void Window::display() const {
    string s(40, '*');

    cout << s << endl;
    cout << "window title: " << title << endl;
    cout << "It has " << buttons.size() << " buttons: " << endl;
    for(const auto &i: buttons)
        cout << i.get_label() << " button" << endl;
    cout << s << endl;
}

void Window::close() {
    cout << "close window '" << title << "'" << endl;
    buttons.at(0).click();
}

void Window::add_button(const string &label) {
    buttons.push_back(Button(label));
}


#include "window.hpp"
#include <iostream>

using std::cout;
using std::cin;

void test() {
    Window w1("new window");
    w1.add_button("maximize");
    w1.display();
    w1.close();
}

int main() {
    cout << "用组合类模拟简单GUI:\n";
    test();
}

实验2

#include <iostream>
#include <vector>

using namespace std;

void output1(const vector<int> &v) {
    for(auto &i: v)
        cout << i << ", ";
    cout << "\b\b \n";
}

void output2(const vector<vector<int>> v) {
    for(auto &i: v) {
        for(auto &j: i)
            cout << j << ", ";
        cout << "\b\b \n";
    }
}

void test1() {
    vector<int> v1(5, 42);
    const vector<int> v2(v1);

    v1.at(0) = -999;
    cout << "v1: ";  output1(v1);
    cout << "v2: ";  output1(v2);
    cout << "v1.at(0) = " << v1.at(0) << endl;
    cout << "v2.at(0) = " << v2.at(0) << endl;
}

void test2() {
    vector<vector<int>> v1{{1, 2, 3}, {4, 5, 6, 7}};
    const vector<vector<int>> v2(v1);

    v1.at(0).push_back(-999);
    cout << "v1: \n";  output2(v1);
    cout << "v2: \n";  output2(v2);

    vector<int> t1 = v1.at(0);
    cout << t1.at(t1.size()-1) << endl;
    
    const vector<int> t2 = v2.at(0);
    cout << t2.at(t2.size()-1) << endl;
}

int main() {
    cout << "测试1:\n";
    test1();

    cout << "\n测试2:\n";
    test2();
}

实验3

#pragma once

#include <iostream>
#include <cassert>

using std::cout;
using std::endl;

// 动态int数组对象类
class vectorInt{
public:
    vectorInt(int n);
    vectorInt(int n, int value);
    vectorInt(const vectorInt &vi);
    ~vectorInt();

    int& at(int index);
    const int& at(int index) const;

    vectorInt& assign(const vectorInt &v);
    int get_size() const;

private:
    int size;
    int *ptr;       // ptr指向包含size个int的数组
};

vectorInt::vectorInt(int n): size{n}, ptr{new int[size]} {
}

vectorInt::vectorInt(int n, int value): size{n}, ptr{new int[size]} {
    for(auto i = 0; i < size; ++i)
        ptr[i] = value;
}

vectorInt::vectorInt(const vectorInt &vi): size{vi.size}, ptr{new int[size]} {
    for(auto i = 0; i < size; ++i)
        ptr[i] = vi.ptr[i];
}

vectorInt::~vectorInt() {
    delete [] ptr;
}

const int& vectorInt::at(int index) const {
    assert(index >= 0 && index < size);

    return ptr[index];
}

int& vectorInt::at(int index) {
    assert(index >= 0 && index < size);

    return ptr[index];
}

vectorInt& vectorInt::assign(const vectorInt &v) {  
    delete[] ptr;       // 释放对象中ptr原来指向的资源

    size = v.size;
    ptr = new int[size];

    for(int i = 0; i < size; ++i)
        ptr[i] = v.ptr[i];

    return *this;
}

int vectorInt::get_size() const {
    return size;
}


#include "vectorInt.hpp"
#include <iostream>

using std::cin;
using std::cout;

void output(const vectorInt &vi) {
    for(auto i = 0; i < vi.get_size(); ++i)
        cout << vi.at(i) << ", ";
    cout << "\b\b \n";
}


void test1() {
    int n;
    cout << "Enter n: ";
    cin >> n;

    vectorInt x1(n);
    for(auto i = 0; i < n; ++i)
        x1.at(i) = i*i;
    cout << "x1: ";  output(x1);

    vectorInt x2(n, 42);
    vectorInt x3(x2);
    x2.at(0) = -999;
    cout << "x2: ";  output(x2);
    cout << "x3: ";  output(x3);
}

void test2() {
    const vectorInt  x(5, 42);
    vectorInt y(10, 0);

    cout << "y: ";  output(y);
    y.assign(x);
    cout << "y: ";  output(y);
    
    cout << "x.at(0) = " << x.at(0) << endl;
    cout << "y.at(0) = " << y.at(0) << endl;
}

int main() {
    cout << "测试1: \n";
    test1();

    cout << "\n测试2: \n";
    test2();
}

实验4

#pragma once

#include <iostream>
#include <cassert>
#define value 0

using namespace std;

// 类Matrix的声明
class Matrix {
public:
    Matrix(int n, int m);           // 构造函数，构造一个n*m的矩阵, 初始值为value
    Matrix(int n);                  // 构造函数，构造一个n*n的矩阵, 初始值为value
    Matrix(const Matrix &x);        // 复制构造函数， 使用已有的矩阵X构造
    ~Matrix();

    void set(const double *pvalue);         // 用pvalue指向的连续内存块数据按行为矩阵赋值
    void clear();                           // 把矩阵对象的值置0
    
    const double& at(int i, int j) const;   // 返回矩阵对象索引(i,j)的元素const引用
    double& at(int i, int j);               // 返回矩阵对象索引(i,j)的元素引用
    
    int get_lines() const;                  // 返回矩阵对象行数
    int get_cols() const;                   // 返回矩阵对象列数

    void display() const;                    // 按行显示矩阵对象元素值

private:
    int lines;      // 矩阵对象内元素行数
    int cols;       // 矩阵对象内元素列数
    double *ptr;
};

Matrix::Matrix(int n,int m)
{
    lines=n;
    cols=m;
    ptr=new double[lines*cols];
    for (int i =0;i<n;++i)
        for (int j=0;j<m;++j)
            ptr[i*lines+j]=value;
}
Matrix::Matrix(int n)
{
    lines=n;
    cols=n;
    ptr=new double[lines*cols];
    for (int i =0;i<n;++i)
        for (int j=0;j<n;++j)
            ptr[i*lines+j]=value;
}
Matrix::Matrix(const Matrix &x){
    lines=x.lines;
    cols=x.cols;
    ptr=new double[lines*cols];
    for (int i =0;i<x.lines;++i)
        for (int j=0;j<x.cols;++j)
        {
            ptr[i*lines+j]=x.ptr[i*lines+j];
        }
}

Matrix::~Matrix()
{
    delete [] ptr;
}

void Matrix::set(const double *pvalue)
{
    
    for(int i=0;i<lines*cols;++i)
        ptr[i]=*pvalue++;
}

void Matrix::clear()
{
    for(int i=0;i<lines;++i)
        for(int j=0;j<cols;++j)
        {
            ptr[i*lines+j]=value;
        }
}

const double& Matrix::at(int i, int j) const
{
    return ptr[i*lines+j];
}

double& Matrix::at(int i, int j)
{
    return ptr[i*lines+j];
}

int Matrix::get_lines() const
{
    return lines;
}

int Matrix::get_cols() const
{
    return cols;
}

void Matrix::display() const
{
    for(int i=0;i<lines*cols;++i) 
    {
        if ((i+1)%cols!=0)
            cout<<ptr[i]<<' ';
        else 
            cout<<ptr[i]<<"\n";
    }
        
}

实验5

#pragma once
#include <iostream>
#include <string>

using namespace std;

class User{
public:
    User(string text);
    User(string text1,string text2,string text3);
    void set_email();
    void change_password();
    void display(); 
private:
    string name;
    string password;
    string email;
};

User::User(string text)
{
    name=text;
    password="123456";
    email="";
}

User::User(string text1,string text2,string text3)
{
    name=text1;
    password=text2;
    email=text3;
}

void User::set_email()
{
    cout<<"Enter email address:  ";
    string text;cin>>text;
    while(text.find('@')==std::string::npos)
    {
        cout<<"illegal email. Please re_enter email:  ";
        cin>>text;
    }
    cout<<"email is set successfully..."<<endl;
    email=text;    
}
void User::change_password()
{
    cout<<"Enter old password:";
    string pre_password;cin>>pre_password;
    int cnt=1;
    for (int i=0;i<2;++i)
    {
        if (pre_password!=password)
        {
            cout<<"password input error. Please re_enter angain:  ";
            cin>>pre_password;
            cnt++;
        }
        else break;
    }
    if (cnt==3) 
    {
        cout<<"password input error. Please try after a while."<<endl; 
        return ;
    }
    cout<<"Enter new password: ";
    string new_password;cin>>new_password;
    password=new_password;
    cout<<"new pssword is set successfully..."<<endl;
}

void User::display()
{
    cout<<"name:   "<<name<<endl;
    string s(password.length(), '*');
    cout<<"pass:   "<<s<<endl;
    cout<<"email:  "<<email<<endl;
}


#include "user.hpp"
#include <iostream>
#include <vector>
#include <string>

using std::cin;
using std::cout;
using std::endl;
using std::vector;
using std::string;

void test() {
    vector<User> user_lst;

    User u1("Alice", "2024113", "[email protected]");
    user_lst.push_back(u1);
    cout << endl;

    User u2("Bob");
    u2.set_email();
    u2.change_password();
    user_lst.push_back(u2);
    cout << endl;

    User u3("Hellen");
    u3.set_email();
    u3.change_password();
    user_lst.push_back(u3);
    cout << endl;

    cout << "There are " << user_lst.size() << " users. they are: " << endl;
    for(auto &i: user_lst) {
        i.display();
        cout << endl;
    }
}

int main() {
    test();
}

实验6

#ifndef __DATE_H__
#define __DATE_H__
class Date{
private:
    int day;
    int month;
    int year;
    int totalDays;
public:
    Date(int year,int month,int day);
    int getDay()const {return day;}
    int getMonth()const {return month;}
    int getYear()const {return year;}
    int getMaxDay() const;
    bool isLeapYear() const
    {
        return year%4==0&&year%100!=0||year%400==0;
    }
    void show() const;
    int Distance(const Date& date) const{
        return totalDays-date.totalDays;
    }
};
#endif


#include "date.h"
#include <iostream>
#include <cstdlib>
using namespace std;
namespace{
    const int DAYS_BEFORE_MONTH[]={0,31,59,90,120,151,181,212,243,273,304,334,365};
}
Date::Date(int year,int month,int day):year(year),month(month),day(day)
{
    if (day<=0||day>getMaxDay())
    {
        cout<<"Invalid date"<<endl;
        show();
        cout<<endl;
        exit(-1);
    }
    int years=year-1;
    totalDays=years*365+years/4-year/100+year/400+DAYS_BEFORE_MONTH[month-1]+day;
    if (isLeapYear()&&month>2)totalDays++;
}
int Date::getMaxDay() const
{
    if (isLeapYear()&&month==2)
    {
        return 2;
    }
    else 
    {
        return DAYS_BEFORE_MONTH[month]-DAYS_BEFORE_MONTH[month-1];
    }
}
void Date::show() const
{
    cout<<getYear()<<"-"<<getMonth()<<"-"<<getDay();
}


#ifndef __ACCOUNT_H__
#define __ACCOUNT_H__
#include "date.h"
#include <string>
class SavingsAccount{
private:
    std::string id;
    double balance;
    double rate;
    Date lastDate;
    double accumulation;
    static double total;
    void record(const Date &date,double amount,const std::string &desc);
    void error(const std::string &msg) const;
    double accumulate(const Date &date) const
    {
        return accumulation+balance*date.Distance(lastDate);
    }
public:
    SavingsAccount(const Date &date,const std::string &id,double rate);
    const std::string &getId() const {return id;}
    double getBalance() const {return balance;}
    double getRate() const {return rate;}
    static double getTotal() {return total;}
    void deposit (const Date &date,double amount,const std::string &desc);
    void withdraw (const Date &date,double amount,const std::string &desc);
    void settle (const Date &date);
    void show() const;
}; 
#endif


#include "account.h"
#include <cmath>
#include <iostream>
using namespace std;
double SavingsAccount::total=0;
SavingsAccount::SavingsAccount(const Date &date,const std::string &id,double rate)
    :id(id),balance(0),rate(rate),lastDate(date),accumulation(0)
{
    date.show();
    cout<<"\t#"<<id<<"created"<<endl;
}
void SavingsAccount::record(const Date &date,double amount,const std::string &desc)
{
    accumulation=accumulate(date);
    lastDate=date;
    amount=floor(amount*100+0.5)/100;
    balance+=amount;
    total+=amount;
    date.show();
    cout<<"\t#"<<id<<"\t"<<amount<<"\t"<<balance<<"\t"<<desc<<endl;
}
void SavingsAccount::error(const string &msg) const
{
    cout<<"Error(#"<<id<<")"<<msg<<endl;
}
void SavingsAccount::deposit(const Date &date,double amount,const string &desc)
{
    record(date,amount,desc);
}
void SavingsAccount::withdraw(const Date &date,double amount,const string &desc)
{
    if (amount>getBalance())
    {
        error("not enough money");
    }
    else 
    {
        record(date,-amount,desc);
    }
}
void SavingsAccount::settle(const Date &date)
{
    double interest=accumulate(date)*rate/date.Distance(Date(date.getYear()-1,1,1));
    if (interest!=0)
    {
        record(date,interest,"interest");
        accumulation=0;
    }
}
void SavingsAccount::show() const
{
    cout<<id<<"\tBalance:"<<balance;
}
 


#include "account.h"
#include <iostream>
using namespace std;
int main()
{
    Date date(2008,11,1);
    SavingsAccount accounts[]=
    {
        SavingsAccount(date,"03755217",0.015),
        SavingsAccount(date,"02342342",0.015)
    };
    const int n=sizeof(accounts)/sizeof(SavingsAccount);
    
    accounts[0].deposit(Date(2008,11,5),5000,"salary");
    accounts[1].deposit(Date(2008,11,25),10000,"sell stock 0323");
    accounts[0].deposit(Date(2008,12,5),5500,"salary");
    accounts[1].withdraw(Date(2008,12,20),4000,"buy a laptop");
    cout<<endl;
    for (int i=0;i<n;i++)
    {
        accounts[i].settle(Date(2009,1,1));
        accounts[i].show();
        cout<<endl;
    }
    cout<<"Total:"<<SavingsAccount::getTotal()<<endl;
    return 0;
}

 

标签：std,const,string,int,void,实验,cout
From： https://www.cnblogs.com/5742TD/p/18531179

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