C++ LNK1120 和 LNK2019 错误：“无法解析的外部符号 WinMain@16”

我正在尝试做戴特尔书中的另一个练习。该程序计算每月利息并打印每个储户的新余额。由于练习是与动态内存相关的章节的一部分，因此我使用“new”和“delete”运算符。由于某种原因，我收到这两个错误：

LNK2019：函数 ___tmainCRTStartup 中引用了无法解析的外部符号 WinMain@16

致命错误 LNK1120：1 个未解析的外部

这是类头文件。

//SavingsAccount.h
//Header file for class SavingsAccount

class SavingsAccount
{
public:
    static double annualInterestRate;

    SavingsAccount(double amount=0);//default constructor intialize  
                                        //to 0 if no argument

  double getBalance() const;//returns pointer to current balance
  double calculateMonthlyInterest();
  static void modifyInterestRate(double interestRate):

  ~SavingsAccount();//destructor

private:
    double *savingsBalance;
};

包含成员函数定义的 Cpp 文件

//SavingsAccount class defintion
#include "SavingsAccount.h"

double SavingsAccount::annualInterestRate=0;//define and intialize static data
                                        //member at file scope


SavingsAccount::SavingsAccount(double amount)
:savingsBalance(new double(amount))//intialize savingsBalance to point to new object
{//empty body
}//end of constructor

double SavingsAccount::getBalance()const
{
    return *savingsBalance;
}

double SavingsAccount::calculateMonthlyInterest()
{
    double monthlyInterest=((*savingsBalance)*annualInterestRate)/12;

    *savingsBalance=*savingsBalance+monthlyInterest;

    return monthlyInterest;
}

void SavingsAccount::modifyInterestRate(double interestRate)
{
    annualInterestRate=interestRate;
}

SavingsAccount::~SavingsAccount()
{
    delete savingsBalance;
}//end of destructor

最后结束驱动程序：

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

using namespace std;

int main()
{
SavingsAccount saver1(2000.0);
SavingsAccount saver2(3000.0);

SavingsAccount::modifyInterestRate(0.03);//set interest rate to 3%

cout<<"Saver1 monthly interest: "<<saver1.calculateMonthlyInterest()<<endl;
cout<<"Saver2 monthly interest: "<<saver2.calculateMonthlyInterest()<<endl;

cout<<"Saver1 balance: "<<saver2.getBalance()<<endl;
cout<<"Saver1 balance: "<<saver2.getBalance()<<endl;

return 0;
}

我花了一个小时试图解决这个问题但没有成功。

转到“链接器设置 -> 系统”。将“子系统”字段从“Windows”更改为“控制台”。