我试图做从Deitel公司的书另一个练习。 程序计算,每月利息并打印新的余额为每个储户的。 由于演习是涉及到动态内存的一章的一部分,我使用的“新”和“删除”操作符。 出于某种原因,我得到这两个错误:
LNK2019:无法解析的外部符号的WinMain @ 16在功能上___tmainCRTStartup引用
致命错误LNK1120:1个无法解析的外部
下面是类的头文件。
//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;
};
与成员函数定义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
结束最后的驱动程序:
#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;
}
我花了一个小时的努力没有成功摸不着头脑。