2. 程式人生 > 實用技巧 >c++程式設計實踐——銀行系統

c++程式設計實踐——銀行系統

阿新 • • 發佈：2020-10-13

銀行系統

本科大二程式設計實踐的作業，算是一個比較簡單的專案吧，主要使用的程式設計正規化有面向物件程式設計

其中引入<multimap><map>標頭檔案實現多對映輸出存取記錄

引入<fstream>實現檔案的讀取和寫入，進而新增每次開啟後能夠觀察前面的存取記錄功能。

中間有很多使用了特例的地方，可以作為簡單的參考，但是不能完全解決所有問題

一、測試樣例

comman.txt

a s S3755217 0.015
a s 02342342 0.015
a c C5392394 10000 0.0005 50
c 5
d 0 5000 salary
c 15
w 2 2000 buy a cell
c 
 
25
d 1 10000 sell stock 0323
n
d 2 2016 repay the credit
c 5
d 0 5500 salary
n
c 15
w 2 1500 buy a television

輸出結果

二、程式碼部分

date.h

#pragma once
//date.h
#include <iostream>
//using namespace std::rel_ops;
using namespace std;
class Date
{
public:
    Date() = default;
    Date(int, int, int);                    //
 
利用建構函式完成初始化
    ~Date();                                //析構
    bool operator < (const Date& date) const {
        if (year > date.year) {
            return 0;
        }
        else if (year < date.year) {
            return 1;
        }
        else if (year == date.year) {
            
 
if (month > date.month) {
                return 0;
            }
            else if (month < date.month) {
                return 1;
            }
            else if (month == date.month) {
                if (day > date.day) {
                    return 0;
                }
                else if (day < date.day) {
                    return 1;
                }
                else
                    return 0;
            }


        }
    
    }




    //Date(int, int, int);
    //int deltadate;
    bool Isleapyear(int);                                //是否是閏年
    int DayInYear(int, int, int);                        //這一天是這一年的那一天
    int datebetween(int, int, int, int, int, int);            //兩個日期之間的距離
    void showdate();

    static Date read(char*);

    int getDay();
    int getMonth();
    int getYear();
    int getMaxDay();

    int year = 0;
    int month = 0;
    int day = 0;

private:


};
#pragma once

accounnt.h

#pragma once
//account.h
#ifndef __ACCOUNT_H__
#define __ACCOUNT_H__
#include "date.h"
#include <iostream>
#include <utility>
#include <map>
using namespace std;
extern double total;
class Accumulator :public Date                                    //accumulator 類
{
public:
    Accumulator() = default;
    Accumulator(Date, double);
    ~Accumulator();
    double getsum(Date);
    void change(Date, double);
    Date lastdate;
    double sum;
    double value;
private:

};
class AccountRecord
{
public:
    Date date;
//    const Account* account;
    string id;
    double amount;
    double balance;
    string desc;
    //std::multimap
    void show();
    AccountRecord(Date, string,double,double);
    AccountRecord();
    ~AccountRecord();
private:
};
extern multimap<Date, AccountRecord> recordmap;
class Account :public Accumulator , AccountRecord                    //基類
{
public:

    string id;                                        //賬號
    double balance;                                        //餘額
    double rate;                                        //利率
    double accumulation;                                //餘額之和
    static double  getTotal();                                        //總餘額
    static double total;                                            //總餘額函式
    
    static void query(Date,Date) ;
    static multimap<Date,AccountRecord> recordmap;
    virtual void show();

    virtual void deposit(Date, double, string) = 0;
    virtual void withdraw(Date, double,string) = 0;
    virtual void settle(Date)=0;
    

    Account();
    Account(Date, const string);
    ~Account();
    void record(Date, double);                                    //record函式，記錄當前餘額
    double accumulate(int deltadate) const {
        return accumulation + balance * (deltadate);
    }
private:
};

class SavingsAccount :public Account
{
public:
    SavingsAccount();                                        //預設建構函式
    SavingsAccount(Date, string, double);                //建構函式   日期、id、餘額
    ~SavingsAccount();                                        //解構函式
    //void getId(const char*);
    //void getRate(double);
    void show();                                                //顯示賬戶資訊
    void deposit(Date, double, string);                    //存款
    void withdraw(Date, double,string);                    //取款
    void settle(Date);                                        //結算利息
private:
    Accumulator acc;
};
class CreditAccount :public Account
{
public:
    CreditAccount();
    CreditAccount(Date, string, double, double, double);                    //建構函式
    ~CreditAccount();                                                        //解構函式
    void  deposit(Date, double, string);                                //存錢
    void withdraw(Date, double, string);                                //取錢
    void settle(Date);
    void show();                                                //顯示賬戶資訊
private:
    //Accumulator acc;
    double credit;
    double fee;
    Accumulator acc;
};



#endif

account.cpp

#include <cmath>
#include <utility>
#include <iostream>
#include <map>
#include <cctype>  
#include "account.h"
using namespace std;
//using namespace std::rel_ops;
using std::string;
double Account::total;
multimap<Date, AccountRecord>  Account::recordmap;

AccountRecord::AccountRecord() {

}


Account::Account(Date tempdate, string Id) :Accumulator()                        //建構函式
{

    AccountRecord r1(tempdate, Id,amount,balance);
    lastdate = tempdate;
    id = Id;
    accumulation = 0;
    balance = 0;
}
Account::~Account()
{
}


Accumulator::Accumulator(Date tempdate, double Value) :Date(tempdate)
{
    sum = 0;
    value = Value;
    lastdate = tempdate;
}
Accumulator::~Accumulator()
{
}
void Accumulator::change(Date, double) {

}
double Accumulator::getsum(Date tempdate) {
    int deltadate = datebetween(lastdate.year, lastdate.month, lastdate.day, tempdate.year, tempdate.month, tempdate.day);
    return sum + value * deltadate;
}

SavingsAccount::SavingsAccount(Date tempdate, string Id, double Rate) :Account(tempdate, Id)        //P290
{
    acc.sum = 0;
    id = Id;
    rate = Rate;
    tempdate.showdate();
    acc.lastdate = tempdate;
    cout << "    #" << Id << " created" << endl;
}
SavingsAccount::~SavingsAccount()
{
}/*
void SavingsAccount::getId(const char* p ) {
    id = p;
}
void SavingsAccount::getRate(double Rate) {
    rate = Rate;

}*/
void Account::show() {

}
void Account::settle(Date date) {

}


CreditAccount::CreditAccount(Date tempdate, string Id, double Credit, double Rate, double Fee) :Account(tempdate, Id)
{
    acc.sum = 0;
    balance = 0;
    value = 0;
    id = Id;
    rate = Rate;
    credit = Credit;
    fee = Fee;
    tempdate.showdate();
    acc.lastdate = tempdate;
    cout << "    #" << Id << " created" << endl;
}
CreditAccount::~CreditAccount()
{
}


void SavingsAccount::show() {
    cout << id << "    Balance: " << balance;
}
//show函式定義
void CreditAccount::show() {                                            //顯示賬戶資訊
    cout << id << "    Balance: " << balance << "    Avaliable credit:" << credit + balance;

}
//show函式定義

void Account::deposit(Date, double, string) {

}//實現虛擬函式的多型
void Account::withdraw(Date, double, string) {

}
    //實現虛擬函式的多型



void SavingsAccount::deposit(Date tempdate, double Amount, string desc) {
    acc.value = balance;
    acc.sum = acc.getsum(tempdate);
    record(tempdate, Amount);
    cout << "    " <<desc << endl;
    acc.lastdate = tempdate;                    //acc的lastdate成員，更新，用於計算每次的sum


    total = total + balance;
}
//deposit函式定義
void  CreditAccount::deposit(Date tempdate, double Amount, string desc) {
    acc.value = balance;
    acc.sum=acc.getsum(tempdate);
    record(tempdate, Amount);
    cout << "    " << desc << endl;
    acc.lastdate = tempdate;                    //acc的lastdate成員，更新，用於計算每次的sum

    total = total + balance;
}
//deposit函式定義


    void SavingsAccount::withdraw(Date tempdate, double Amount, string desc) {

    if (Amount > balance) {
        cout << "Error:not enough money" << endl;
    }
    else {
        record(tempdate, -Amount);
        cout << "    " << desc << endl;
        acc.lastdate = tempdate;                    //acc的lastdate成員，更新，用於計算每次的sum
        total = total - Amount;
    }
}
//withdraw函式定義
void CreditAccount::withdraw(Date tempdate, double Amount, string desc) {

    if (Amount > credit) {
        cout << "Error:not enough money" << endl;
    }
    else {
        record(tempdate, -Amount);                                                //record函式
        cout << "    " << desc << endl;
    
        sum=acc.getsum(tempdate);
        value = balance;
        acc.lastdate = tempdate;

        total = total - Amount;
    }
}
//withdraw函式定義


double Account::getTotal() {
    return total;
}
//getTotal 函式定義



void SavingsAccount::settle(Date tempdate) {
    if (balance == 0) {

    }
    else if  (tempdate.year - lastdate.year >= 1) {
        acc.value = balance;
        acc.sum = acc.getsum(tempdate);
        double interest = acc.sum * rate / 366;
        interest = floor(interest * 100 + 0.5) / 100;                //四捨五入
        //int deltadate = datebetween(lastdate.year, lastdate.month, lastdate.day, tempdate.year, tempdate.month, tempdate.day);
        //double interest = accumulate(deltadate) * rate / 366;
        record(tempdate, interest);
        cout << " interest" << endl;
        acc.sum = 0;
        total = total + interest;
        acc.lastdate = tempdate;
    }
}
//計算利息函式
void CreditAccount::settle(Date tempdate) {

    if (tempdate.year - lastdate.year >= 1) {
        acc.value = balance;
        acc.sum = acc.getsum(tempdate);
        double interest = acc.sum * rate;
        interest = floor(interest * 100 + 0.5) / 100;
        //int deltadate = datebetween(lastdate.year, lastdate.month, lastdate.day, tempdate.year, tempdate.month, tempdate.day);
        /*interest = Accumulator(tempdate, rate);*/
        record(tempdate, interest);
        cout << " interest" << endl;
        accumulation = 0;
        //total = total + balance;
        record(tempdate, -fee);
        cout << " annual fee" << endl;
        total = total -fee ;
        acc.sum = 0;
        acc.lastdate = tempdate;
    }
    else {

        acc.value = balance;
        acc.sum = acc.getsum(tempdate);
        double interest = acc.sum * rate;
        interest = floor(interest * 100 + 0.5) / 100;
        //int deltadate = datebetween(lastdate.year, lastdate.month, lastdate.day, tempdate.year, tempdate.month, tempdate.day);
        /*interest = Accumulator(tempdate, rate);*/
        record(tempdate, interest);
        cout << " interest" << endl;
        accumulation = 0;
        //total = total + balance;
        total = total + interest;
        acc.sum = 0;
        acc.lastdate = tempdate;
    }


}


void Account::record(Date tempdate, double Amount) {

    //sum = getsum(tempdate,Amount);
    //    
    //accumulation = accumulate(deltadate);
    //Amount = floor(Amount * 100 + 0.5) / 100;                                        //四捨五入取整
    balance = balance + Amount;
    tempdate.showdate();
    cout << "    " << "#" << id << "    " << Amount << "    " << balance;//列印
    AccountRecord r1(tempdate,id,Amount,balance);

    
    recordmap.insert(make_pair(tempdate, r1));

}



void Account::query(Date date1, Date date2) {
    
    auto iter = recordmap.lower_bound(date1);
    auto end = recordmap.upper_bound(date2);
    while (iter != end) {
        auto pr = recordmap.equal_range(iter->first);
        for (iter; iter != end; ++iter)
            iter->second.show();
    }


}
void AccountRecord::show() {
    date.showdate();
    cout << "    #" << id << "    " << amount << "    " << balance<<endl;
}

AccountRecord::AccountRecord(Date tdate, string Id,double tamount,double tbalance)
{
    amount = tamount;
    balance = tbalance;
    id = Id;
    date = tdate;
}

AccountRecord::~AccountRecord()
{
}

main.cpp

//step5.cpp
#include "account.h"
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

struct deleter {

    template <class T> void operator () (T* p) { delete p; }

};


int main() {
    Date date(2008, 11, 1);//起始日期
    vector<Account*> accounts;//建立賬戶陣列，元素個數為0


    fstream icin;
    icin.open("commands.txt");

    char temp[100] = {0};
    char cmd;
    do {
        
        int cun[10] = {0};                            //儲存desc說明的位置，然後就可以直接輸出
        icin.getline(temp,100);                //讀取檔案內的一行

        int i = 0;
        int j = 0;
        char x[100][100] = {0};
        for (int t = 0; t < 100; t++) {
            cun[i] = t;
            x[i][j] = temp[t];
            j++;
            if (temp[t] == ' ') {
                
                i++;
                j = 0;
                continue;
                
            }
            
        }


        //顯示日期和總金額
        //date.showdate();
        //std::cout << "\tTotal: " << Account::getTotal() << "\tcommand> ";
        char type;
        int index, day;
        double amount, credit, rate, fee;
        string id,desc;
        Account* account;
        Date date1, date2;


        string s = temp;
        

        cmd = x[0][0];
        switch (cmd) {



        case 'a'://增加賬戶
            type = x[1][0];

            if (type == 's') {
                id = x[2];
                rate = strtod(x[3],NULL);
                //rate = x[3];
                //cout << cmd << " " << type << " " << id << " " << rate << endl;
                account = new SavingsAccount(date, id, rate);

            }

            else {
                id = x[2];
                
                credit = strtod(x[3], NULL);
                rate = strtod(x[4], NULL);
                fee = strtod(x[5], NULL);

                //cout << cmd << " " << type << " " << id << " " << credit<<" "<<fee<<endl;
                account = new CreditAccount(date, id, credit, rate, fee);

            }

            accounts.push_back(account);

            break;

        case 'd'://存入現金
            index = atoi(x[1]);
            amount = strtod(x[2], NULL);
            desc = s.substr(cun[2],30); //s.substr(m,n) 意思是取字bai符串dus中位置m處開始，zhi長為n的子串dao
            //cout << cmd << " " << index << " " << amount << " " << desc << endl;
            //getline(cin, desc);
            
            accounts[index]->deposit(date, amount, desc);
            
            break;

        case 'w'://取出現金

            index = atoi(x[1]);
            amount = strtod(x[2], NULL);
            //getline(cin, desc);
            desc = s.substr(cun[2], 30); //s.substr(m,n) 意思是取字bai符串dus中位置m處開始，zhi長為n的子串dao
            //cout << cmd << " " << index << " " << amount << " " << desc << endl;
            accounts[index]->withdraw(date, amount, desc);
        
            break;

        case 's'://查詢各賬戶資訊

            for (size_t i = 0; i < accounts.size(); i++) {

                cout << "[" << i << "] ";

                accounts[i]->show();

                cout << endl;

            }
            break;

        case 'c'://改變日期
            day = atoi(x[1]);
            if (day < date.getDay())

                cout << "You cannot specify a previous day";

            else if (day > date.getMaxDay())

                cout << "Invalid day";

            else

                date = Date(date.getYear(), date.getMonth(), day);
                //cout << cmd << " "<<day<< endl;
            break;

        case 'n'://進入下個月
            //cout << cmd << endl;
            if (date.getMonth() == 12)
                date = Date(date.getYear() + 1, 1, 1);
            else
                date = Date(date.getYear(), date.getMonth() + 1, 1);
            for (vector<Account*>::iterator iter = accounts.begin(); iter != accounts.end(); ++iter)
                (*iter)->settle(date);
            break;
    //    case 'q'://查詢一段時間內的賬目

    //        char p1[200];
    //        cin >> p1;
    //        char p2[200];
    //        cin >> p2;
    //        date1 = Date::read(p1);
    //        date2 = Date::read(p2);
    //        Account::query(date1, date2);
    //        OutFile << p1 << " " << p2 << endl;
    //        break;

        }
    } while (cmd != 'e');

    std::cout << "(a)add account (d)deposit (w)withdraw (s)show (c)change day (n)next month (q)query (e)exit" << endl;
    icin.seekg(0, ios::end);
    icin << endl;

    do {
        //顯示日期和總金額
        date.showdate();
        std::cout << "\tTotal: " << Account::getTotal() << "\tcommand> ";
        char type;
        int index, day;
        double amount, credit, rate, fee;
        string id, desc;
        Account* account;
        Date date1, date2;
        std::cin >> cmd;
        icin << cmd<<" ";
        switch (cmd) {
        case 'a'://增加賬戶
            std::cin >> type >> id;
            if (type == 's') {
            
                std::cin >> rate;
                icin << 's' << " "<<id<<" "<<rate<<endl;
                account = new SavingsAccount(date, id, rate);
            }
            else {
                std::cin >> credit >> rate >> fee;
                icin << 'c' << " "<<id<<" "<<credit<<" "<<rate<<" "<<fee<<endl;
                account = new CreditAccount(date, id, credit, rate, fee);
            }
            accounts.push_back(account);
            break;
        case 'd'://存入現金
            std::cin >> index >> amount;
            desc = "";
            accounts[index]->deposit(date, amount, desc);
            icin << index << " " << amount << " " << desc << endl;
            break;
        case 'w'://取出現金
            std::cin >> index >> amount;
            desc = "";
            accounts[index]->withdraw(date, amount, desc);
            icin << index << " " << amount << " " << desc << endl;
            break;
        case 's'://查詢各賬戶資訊
            for (size_t i = 0; i < accounts.size(); i++) {
                std::cout << "[" << i << "] ";
                accounts[i]->show();
                std::cout << endl;
            }
            icin << endl;
            break;
        case 'c'://改變日期
            std::cin >> day;
            if (day < date.getDay())
                std::cout << "You cannot specify a previous day";
            else if (day > date.getMaxDay())
                std::cout << "Invalid day";
            else
                date = Date(date.getYear(), date.getMonth(), day);
            icin <<day<< endl;
            break;
        case 'n'://進入下個月
            if (date.getMonth() == 12)
                date = Date(date.getYear() + 1, 1, 1);
            else
                date = Date(date.getYear(), date.getMonth() + 1, 1);
            for (vector<Account*>::iterator iter = accounts.begin(); iter != accounts.end(); ++iter)
                (*iter)->settle(date);
            break;
        case 'q'://查詢一段時間內的賬目
            char p1[200];
            std::cin >> p1;
            char p2[200];
            std::cin >> p2;
            date1 = Date::read(p1);
            date2 = Date::read(p2);
            Account::query(date1, date2);
            icin << p1<<" " <<p2 << endl;
            break;
        }
    } while (cmd != 'e');
    for_each(accounts.begin(), accounts.end(), deleter());

    icin.close();
    return 0;

}

date.cpp

#include <iostream>
#include "date.h"


Date::Date(int y, int m, int d)                //利用建構函式完成初始化
{
    year = y;
    month = m;
    day = d;

}
Date::~Date()
{
}
bool Date::Isleapyear(int year) {                            //計算是不是閏年
    return (year % 4 == 0 || year % 400 == 0) && (year % 100 != 0);

}
int Date::DayInYear(int year, int month, int day)                //這一年的第幾天
{
    //int _day = 0;
    int DAY[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
    if (Isleapyear(year))
        DAY[1] = 29;
    for (int i = 0; i < month - 1; ++i)
    {
        day += DAY[i];
    }
    return day;
}
int Date::datebetween(int year1, int month1, int day1, int year2, int month2, int day2) {




    if (year1 == year2 && month1 == month2) {
        return day2 - day1;
    }
    //如果年份月份相同
    else if (year1 == year2) {
        int d1, d2;
        d1 = DayInYear(year1, month1, day1);
        d2 = DayInYear(year2, month2, day2);
        return d1 > d2 ? d1 - d2 : d2 - d1;

    }
    //如果年份相同
    else {
        //確保year1年份比year2早
        if (year1 > year2)
        {
            //swap進行兩個值的交換
            swap(year1, year2);
            swap(month1, month2);
            swap(day1, day2);
        }
        int d1, d2, d3;
        if (Isleapyear(year1))
            d1 = 366 - DayInYear(year1, month1, day1); //取得這個日期在該年還於下多少天
        else
            d1 = 365 - DayInYear(year1, month1, day1);
        d2 = DayInYear(year2, month2, day2); //取得在當年中的第幾天

        d3 = 0;
        for (int year = year1 + 1; year < year2; year++)
        {
            if (Isleapyear(year))
                d3 += 366;
            else
                d3 += 365;
        }
        return d1 + d2 + d3;

    }
    //都不相同情況 親一部分+後一部分



}
void Date::showdate(void) {
    cout << year << "-" << month << "-" << day;

}




int Date::getDay() {
    return day;
}
int Date::getMonth() {
    return month;
}

int Date::getYear() {
    return year;
}
int Date::getMaxDay() {
    int DAY[12] = { 31,28,31,30,31,30,31,31,30,31,30,31 };
    if (Isleapyear(year))
        DAY[1] = 29;

    int MaxDay = DAY[month-1];


    return MaxDay;
}



Date Date::read(char*p) {
    Date date;
    int year=0;
    int month=0;
    int day=0;
    int exp = 1000;


    for (int i = 0; i < 4; i++) {
        int temp = p[i] - 48;
        year += temp*exp;
        exp = exp / 10;
    }

    exp = 10;

    for (int i = 5; i < 7;i++) {
        int temp = p[i] -48;
        month +=temp * exp;
        exp = exp / 10;
    }
    for (int i = 8; i < 9; i++) {
        day = p[i]-48;
    }
    date.year = year;
    date.month = month;
    date.day = day;


        return date;

}

相關推薦

c++程式設計實踐——銀行系統

銀行系統 本科大二程式設計實踐的作業，算是一個比較簡單的專案吧，主要使用的程式設計正規化有面向物件程式設計

C++ - 程式設計實踐

opencv影象處理時使用stringstream批量讀取圖片，處理後並儲存 C/C++讀取檔名（Ubuntu）

C語言初級程式設計實踐：2048小遊戲

大部分同學學習C語言程式設計以後不知道能通過什麼樣的專案才可以鍛鍊自己的思維功力，2048相信大家都應該熟悉，不管是手機上還是網頁版的相信大家都玩過,這個簡單的控制檯版本的遊戲是我曾經在偉易達上班時一個嵌入

linux下通過C語言程式設計實現讀取系統資訊 - Meminfo

技術標籤：C語言 在linux下程式設計，常常需要獲取系統資訊，以下通過程式設計實現抓取系統資訊，可以將下列程式碼作為一個模板來修改實現自己的需求。

c#程式設計最佳實踐1：異常處理

技術標籤：C#資料結構與演算法 — 你是否在使用者輸入驗證中使用異常處理機制?

學習筆記 --《C++程式設計規範101條規則、準則與最佳實踐》

《C++程式設計規範101條規則、準則與最佳實踐》中的部分準則 程式設計規範101條

面向物件C++程式設計與實踐考試題目

一、選擇題（每題2分，共2×20=40分） (1) 以下不能對陣列 a 進行正確初始化的語句是()。

程式語言與程式設計實踐2-> 藍橋杯C/C++備賽記錄1 | 入門瞭解與首周訓練

寒假前班主任幫我們報了名，是得好好準備準備。作為一個CSer，coding能力一定不能太弱。我反思，好久沒寫C/C++程式碼了，淨是些隨手寫的python指令碼，剛開始上手題目bug一大堆。

linux系統使用C#程式設計操作串列埠(.net6)

環境介紹 linux系統: Ubuntu 22.04 IDE: VS2022 Preview 17.3.0 1.新建專案 2.開啟NuGet包管理器

【轉】C語言表驅動法程式設計實踐

來源：C語言表驅動法程式設計實踐(精華帖,建議收藏並實踐) (qq.com) 資料壓倒一切。如果選擇了正確的資料結構並把一切組織的井井有條，正確的演算法就不言自明。程式設計的核心是資料結構，而不是演算法。

C++實現圖書管理系統

閒來無事，用C++做了一個圖書管理系統，主要有借書、還書、圖書管理、使用者管理等功能，主要用到的技術有容器和檔案，以及類的封裝

C++實現通訊錄管理系統

本文例項為大家分享了C++通訊錄管理系統的具體程式碼，供大家參考，具體內容如下

基於C語言實現點菜系統

本文例項為大家分享了C語言點菜系統的具體程式碼，供大家參考，具體內容如下

python銀行系統實現原始碼

本文例項為大家分享了python實現銀行系統的具體程式碼，供大家參考，具體內容如下

Python銀行系統實戰原始碼

本文例項為大家分享了Python銀行系統的具體程式碼，供大家參考，具體內容如下

C++如何獲取當前系統時間及格式化輸出

本文主要使用time() 及strftime() 函式實現c++獲取系統時間。 C++系統和時間相關的函式基本上都是使用C語言提供的標準介面

使用C++11實現Android系統的Handler機制

封面出自：板栗懶得很背景 執行緒作為系統的基礎資源，相信大多數讀者都有使用到。一般情況下我們會直接開一個執行緒做一些耗時操作，處理完之後讓執行緒自動結束，資源被系統回收。這種簡單粗暴的方法不少讀者、甚

java+mysql模擬實現銀行系統

類比電子銀行，開戶，存錢，取錢，查詢使用者資訊，修改使用者資訊，查詢餘額，查詢明細，登出，退出，等等

《刻意練習之C#》-0006- 型別系統

CTS (Common Type System) .NET型別系統的基石： 型別繼承：一個型別可以繼承至另一個型別（基類），繼承基類的方法、屬性和其他成員；.NET內建的數值型別都繼承至基類System.Object (C#的關鍵字：object)；這樣的

C/C++實現個人收支系統的示例程式碼

昨天朋友委託我做一個基於C++的課程小設計，題目如下： 設計一個簡單的個人收支管理系統，至少包括如下功能：