[問題] 解構子

[hateexam ()]

每次調用構造函數後，count的數值都是0？？
感覺好像每一次while迴圈就呼叫解構子一次，所以才會一直為0
所以試著將解構子的--count;註解掉 果然就就沒事了,開始累加了

為何會這樣呢？


#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <stdlib.h>
#include <iostream>
using namespace std;
const int OK = 1;
const int Error = 0;
class ACountList;

class ACount{
        private:
                static float rate;
                char name[20];
                int password;
                int balance;
        public:
                static int count;
                ACount() {}
                ACount(char [],int);
                ~ACount()
                {--count;}
                void openAcount(ACount user[]);
                void deleteAcount();
                int save(ACount &x, int money);
                int take(ACount &x, int money);
                void display(ACount &x);
                void Print(int n);
                static int getCount(){return count;}
                friend class ACountList;

};

int ACount::count=0;

ACount::ACount(char nm[20],int pw) //構造函數,開戶後count加1
{
        strcpy(name,nm);
        password=pw;
        ++count;
        balance=0;
}

void ACount::openAcount(ACount user[])//開戶
{
        char Name[20];
        int Password;
        cout<<"please input your name:"<<endl;
        cin>>Name;
        cout<<"please input your password:"<<endl;
        cin>>Password;
        user[ACount::count]=ACount(Name,Password);
        cout<<"success!"<<endl;
        cout<<count;
        system("pause");
}

void ACount::deleteAcount()//刪除
{
        int n;
        cout<<"Input the number of the acount you want to delete:";
        cin>>n;
        if(count==n)
                --count;
        else if(0<count&&count<n)
                {--count;}
        else
                cout<<"Input error\n";
}

int ACount::save(ACount &x, int money)//存錢
{
        if(money>0)
        {
                x.balance+=money;
                return OK;
        }

        return Error;
}

int ACount::take(ACount &x, int money)
{//取錢
        if(money>0&&x.balance-money>=0)
        {
                x.balance-=money;
                return OK;
        }

        return Error;
}

void ACount::display(ACount &x)
{//列印
        cout<<endl<<x.name<<"\t";
        cout<<x.balance<<endl;
}

void ACount::Print(int n)
{//查詢
        cout<<"No."<<n<<"\t"<<name<<"\t\t"<<balance<<endl;
}

inline void topmenu()//一級菜單
{
        cout<<"\n****************************************************";
        cout<<"\n*Option of the Program *";
        cout<<"\n* *";
        cout<<"\n* 1. Register *";
        cout<<"\n* 2. Delete *";
        cout<<"\n* 3. Oprate *";
        cout<<"\n* 0. Exit *";
        cout<<"\n* *";
        cout<<"\n****************************************************";
}

void main()
{
        ACount *user;
        user=new ACount[10];
        int op;
        while (1)
        {
                system("cls");
                topmenu();
                cout<<"\n please enter selection:";
                cin>>op;
                switch(op)
                {
                        case 1:
                                user[ACount::count].openAcount(user);
                                break;
                        case 2:
                                user[ACount::getCount()].deleteAcount();
                                break;
                        case 3:
                                break;
                        case 0:
                                exit(0);
                        default:
                                cout<<"\n Selection error!";
                                break;
                }
        }
}

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--
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◆ From: 218.172.108.115
※ 編輯: hateexam        來自: 218.172.108.115      (05/27 00:16)
→ legnaleurc:縮排會比標色還有幫助
※ 編輯: hateexam        來自: 218.172.108.115      (05/27 01:29)
→ akasan:ACount() {} <--問題點 陣列會呼叫這個建構子
→ akasan:而這個傢伙沒更新count
→ akasan:另外user[ACount::count].openAcount(user); 會有問題
→ akasan:陣列能用的indxe 只有0~9而已
→ akasan:還有預設建構子的地方記得初始化name 至少在name[0]塞'\0'
→ hateexam:不好意思 可以在請問一下嗎 就是ACount() {}這裡沒變
→ hateexam:但將~ACount() {}裡的count--註解掉就能累加了耶
→ hateexam:為啥會這樣 不是主程式結束掉才會呼叫解構子嗎
→ hateexam:另外其他部份的錯誤 感謝提醒^^
→ hateexam:還真沒注意到....
推 VictorTom:不是主程式結束才呼叫解構子, 是這個obj大限到了該掛了
→ VictorTom:就會呼叫; ex1: delete obj;  ex2: { OBJ obj; ... }