C ++中的构造函数初始化[重复]

Posted 2023-02-22

【中文标题】C ++中的构造函数初始化[重复]

【英文标题】：constructor initialization in c++ [duplicate]

【发布时间】：2020-10-25 00:30:34

【问题描述】：

我是一名编程专业的学生，​​但我的教授拒绝解释任何事情，在这个作业中她介绍了课程，而我正在努力理解构造函数的概念/语法。我的两行代码出现“匹配构造函数”错误（我已经用 cmets 标记了它们，问题代码行都在 main 中。）代码是银行账户 sim，它需要取款、存款和计算帐户上的利率。谁能解释一下是什么问题？

main.cpp

#include <iostream>
#include "Account.h"
#include "SavingsAcc.h"
#include <iomanip>
using namespace std;

int main() 
  
  //savings account information
  SavingsAccount savAcc, *savingsAcc = &savAcc;//savAcc CONSTRUCTOR ERROR "no matching constructor for initialization of SavingsAccount"

  savAcc.setAccNum(1234);
  savAcc.setAccBal(322.75);
  savAcc.setNumWithdrawal(2);
  savAcc.setNumDep(3);
  savAcc.setAnnIntRate(0.06);
  savAcc.setMonthServCharg(2.50);

  //misc declarations
  int option; 
  
  do
  
    cout << "Logged in successfully...\nSAVINGS ACCOUNT\n1. Desposit\n2. Withdraw\n3. Logout\nEnter option: " << endl;
    cin >> option;
  
    switch (option)
    

    case 1:

    SavingsAccount savAccObj; //CONSTRUCTOR ERROR "no matching constructor for initialization of SavingsAccount"

    savAccObj.deposit;
    
    case 2:

    savAccObj.withdraw;
    

  
  while (option != 3);

帐户.cpp

#include "Account.h"
#include <iostream>
#include <iomanip>
using namespace std;


Account::Account();//constructor


//overloaded constructor
Account::Account(double accBal, double annIntRate)
  accBal = accBal;
  annIntRate = 0;
;

//deposit base class function
int Account::deposit(double accBal, int numDepos)

  double depos;
  cout << "Enter deposit: "<< endl;
  cin >> depos;
  accBal += depos;
  numDepos ++;
  return accBal;


//withdraw base class function
void Account::withdraw(double accBal, int numWithdrawal)

  double amount; 
  cin >> amount;
  accBal -= amount;
  numWithdrawal ++; 


//interest rate calculation
void Account::calcInt(double accBal, double annIntRate)

  double monthlyIntRate = annIntRate/2;
  double monthlyInt = accBal * monthlyIntRate;
  accBal += monthlyInt;

帐户.h

#ifndef ACCOUNT_H
#define ACCOUNT_H

class Account

  //variable declarations
  private:
  
  int accNum;
  double accBal;
  int numWithdrawal;
  int numDepos;
  double annIntRate;
  double monthServCharg;
  
  public:

  Account();

  Account(double, double); //overloaded constructor
  
  virtual int deposit(double, int); //base class deposit declaration 
  
  virtual void withdraw(double, int); //base class withdraw declaration
  
  virtual void calcInt(double, double); //updates interest rate
  
  void setAccNum(int); //setter
  int getAccNum()return accNum; //getter

  void setAccBal(double);//setter
  double getAccBal()return accBal;//getter

  void setNumWithdrawal(int);//setter
  int getNumWithdrawal()return numWithdrawal;//getter

  void setNumDep(int);//setter
  int getNumDep()return numDepos;//getter

  void setAnnIntRate(double);//setter
  double getAnnIntRate()return annIntRate;//getter

  void setMonthServCharg(double); //setter
  double getMonthServCharg()return monthServCharg;//getter
;
#endif

SavingsAcc.cpp

#include "SavingsAcc.h"
#include "Account.h"
#include <iostream>
using namespace std;

//status constructor
SavingsAccount::SavingsAccount(bool status)

  status = false;


//deposit money function
void SavingsAccount::deposit(bool status, double accBal, int numDepos) 

  Account obj;
  obj.deposit(accBal,0);

  if (accBal > 25.00)
  status = true;
  else 
  status = false;


//withdraw money child function, updates account status, service charges, interest rate etc
void SavingsAccount::withdraw(double accBal, int numWithdrawal, double annIntRate, double monthServCharg) 

  double amount;
  if (accBal <= 25.00)
  cout << "Balance too low, withdrawals cannot be made at this time"<<endl;
  else
  
    do
     
      Account obj;
      obj.withdraw(numWithdrawal, 0); // parent deposit function
      
      if (numWithdrawal > 4)
      monthServCharg += 1;

      if (accBal < 25.00)
      annIntRate += 0.01;
    
    while (amount > accBal);
    cout << "Insufficient funds!";
  
   


//outputs the report of account 
void SavingsAccount::accountReport(int accNum, bool status, int numWithdrawal, int numDepos, double monthServeCharg, double accBal)

  
  cout << "====ACCOUNT STATUS===="<<endl;
  cout << "Account number: "<< accNum <<endl;
  
  if (status == true) //status 
  cout << "Satus: Active" << endl;
  else 
  cout <<"Status: Inactive" << endl;

  cout << "Total deposits: "<< numDepos << endl;
  cout << "Total withdrawals" << numWithdrawal << endl;
  cout << "Service charges: "<< monthServeCharg << endl;
  cout << "Balance: "<<accBal<<endl;

SavingsAcc.h

    #ifndef SAVINGSACC_H
#define SAVINGSACC_H
#include <iostream>

class SavingsAccount: public Account

  private:
   
    bool status; //status variable
  
  public:

  SavingsAccount(bool); // constuctor
  
  void deposit(bool, double, int); // deposit function
  
  void withdraw(double, int, double, double); //withdraw function

  void accountReport(int, bool, int, int, double, double ); // full report of account
;
#endif

【问题讨论】：

如果你想让SavingsAccount savAccObj;工作，你需要为SavingsAccount提供一个零参数构造函数。

【参考方案1】：

SavingsAccount 的构造函数将bool 作为输入，但在创建savAcc 和savAccObj 对象时，您没有传入bool 值。