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下面是我包含在另一个 .cpp 文件中的 .cpp 文件。我收到一个错误，指出 emp.grosPay() 必须是可修改的左值。关于修复它的任何想法？

 #include <iostream>
#include <string>
#include "weeklyEmp.h"

using namespace std;

const double WEEKLY_ALLOWANCE = 39.42;
const double FICA_TAX_RATE = 0.0765;
weeklyEmp::weeklyEmp()
{
    my_name = ?name?;
}
weeklyEmp::weeklyEmp(string initName,
    double initHours,
    double initRate,
    int initExemptions,
    string initFilingStatus)
{
    my_name; initName;
    my_hours; initHours;
    my_rate; initRate;
    my_exemptions; initExemptions;
    my_filingStatus; initFilingStatus;
}

//--modifiers

void weeklyEmp::set_hours(double thisWeeksHours)
    //post: Set the hours worked for a given week
{
    my_hours = thisWeeksHours;
}



void weeklyEmp::set_rate(double thisWeeksRate)
//post: Change the employee's hourly rate of pay
{
 my_rate = thisWeeksRate;
}

//--accessors
double weeklyEmp::grosPay() const
//post: Return gross pay with overtime

{if(my_hours <=40) return my_hours * my_rate;
else
return (40*my_rate) + (my_hours-40) * 1.5 * my_rate;
}

double weeklyEmp::incomeTax() const
//post: Return the federal income tax
{
double result(0.0);
double taxableIncome(grosPay() - my_exemptions * WEEKLY_ALLOWANCE); 
if(my_filingStatus == "S" || my_filingStatus == "s")
{
if (taxableIncome <= 23.00)
result = 0.00;
else if(taxableIncome <= 397.00)
result = 0.15 * (taxableIncome - 23.00);
else if(taxableIncome <= 928.00)
result = 56.10 + 0.28 * (taxableIncome - 397.00);
else if(taxableIncome <= 2121.00)
result = 204.78 + 0.33 * (taxableIncome - 928.00);
else
result = 598.47 + 0.28 * (taxableIncome - 2121.00);
} 
if(my_filingStatus == "M" || my_filingStatus == "m")
{
if(taxableIncome <= 65.00)
result = 0.00;
else if(taxableIncome <= 689.00)
result = 0.15 * (taxableIncome - 65.00);
else if(taxableIncome <= 1573.00)
result = 93.60 + 0.28 * (taxableIncome - 689.00);
else if(taxableIncome <= 3858.00)
result = 341.12 + 0.33 * (taxableIncome - 1573.00);
else
result = 1095.17 + 0.28 * (taxableIncome - 3858.00);
} 
/* round to the nearest penny */
/* include compfun.cpp for round function */
result =(result, 2);  
return result;
}

double weeklyEmp::FICATax() const
//post: Return the social security tax
{
    return grosPay() * FICA_TAX_RATE; 
}

string weeklyEmp::name() const
//post: Return the employee's name

{ return my_name;

}

有错误的代码部分在下面并标记为* **

int main()
{
    string name;
    double rate;
    double hours;
    int exemptions;
    string filingStatus;


    cout <<"Name: ";
    cin >> name;
    cout << "Hourly Rate:";
    cin >> rate;
    cout << "Hours Worked:";
    cin >> hours;
    cout << "Exemptions: ";
    cin >> exemptions;
    cout<< "S) ingle / M) arried: ";
    cin >> filingStatus;
    cout << " " << endl;

    weeklyEmp emp(name, hours, rate, exemptions, filingStatus);
    double net = ***emp.grosPay()*** = emp.incomeTax() - emp.FICATax();

}
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2 回答 2

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double net = emp.grosPay() = emp.incomeTax() - emp.FICATax();
//                        ^^^

grosPay不返回参考，所以我假设你不是要在=那里使用标志。可能是手误。

您的意思是使用减号运算符-吗？：

double net = emp.grosPay() - emp.incomeTax() - emp.FICATax();
//                        ^^^

发生错误是因为您无法修改const对象、函数返回的对象const或未绑定到非 const 右值引用的右值。

于 2013-05-26T21:49:04.410 回答
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double net = ***emp.grosPay()*** = emp.incomeTax() - emp.FICATax();
                                ^^^

第二个“=”应该是一个“-”号；我认为您正在尝试减去，而不是分配。

于 2013-05-26T21:49:28.990 回答