[問題] 解構子

看板C_and_CPP (C/C++)作者hateexam時間16年前 (2009/05/27 00:15)推噓1(1推 0噓 12→)

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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; } } } -- 你知道每年全球有多少人死於飢餓嗎?美國的「The Hunger site」 http://www.thehungersite.com/clickToGive/home.faces?siteId=1 網站上只要網友每天上網按一次，他們就會聯合世界企業家,捐給世界各地饑民一碗食物，光是去年一整年，「The Hunger site」就送出了4,800萬碗食物給世界各地需要的饑民.只要連上網路，動動你的滑鼠，加入首頁,每天擊點一次就可以幫助一個人, -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 218.172.108.115 ※ 編輯: hateexam 來自: 218.172.108.115 (05/27 00:16)