Question

有我的代码，但是我现在正在获取这些错误代码，我知道这里有很多错误。

因此，对于为什么某些错误会在公共类Employee中将其声明为顶部时将其不在范围内，我感到困惑。同样，当我从功率类创建子类时，为什么仍然会有错误说它不在范围内，即使它们是功率类的子类也是如此。

我正在使用const char *，但仍然出现错误。感谢您查看我的代码！我非常感谢您的投入。

#include <iostream>
#include <string>
using namespace std;

class Employee {

    public:
        Employee ();
        void setEmployeeName (string name);
        void setEmployeeNumber (string EmployeeID);
        void setHireDate (string date);
        string getEmployeeName ();
        string getEmployeeNumber ();
        string getHireDate ();

    protected:
        string employeeName;
        string employeeNumber;
        string hireDate;
};
Employee::Employee () {
    employeeName = "Please Enter a name.";
    employeeNumber = "Please enter an Employee Number";
    hireDate = "Not Avaliable";
}

void Employee::setEmployeeName (string name) {
    employeeName = name;
}

void Employee::setEmployeeNumber (string EmployeeID) {
    employeeNumber = EmployeeID;
}

void Employee::setHireDate (string date) {
    hireDate = date;
}

string Employee::getEmployeeName () {
    return employeeName;
}

string Employee::getEmployeeNumber () {
    return employeeNumber;
}

string Employee::getHireDate () {
    return hireDate;
}

class ProductionWorker : public Employee {

    public:
        ProductionWorker ();
        void setShift (const char * workday);
        void setHourlyPayRate (double payRate);
        const char * getShift ();
        double getHourlyPayRate ();
        void Print ();

    private:
        int workday;
        double hourlyPayRate;
};
ProductionWorker::ProductionWorker () {
    int shift = 0;
    hourlyPayRate = 0.0;
}

void ProductionWorker::setShift (const char * workday) {
    const char * shift = workday;
}

void ProductionWorker::setHourlyPayRate (double payRate) { 
    hourlyPayRate = payRate; 
}

int getShift () { 
    if (const char * shift == 0)
        return "No Shift.";
    else if (const char * shift == 1) 
        return "Day Shift.";
    else if (const char * shift == 2)
        return "Night Shift.";
    else 
        return "Error.";

}

double ProductionWorker::getHourlyPayRate () {
    return hourlyPayRate;
}

void Print () {
    cout << "Name of Employee: " << getemployeeName << endl
         << "Employee ID Number: " << getemployeeNumber << endl
         << "Date of Employment: " << gethireDate << endl
         << "Shift: " << getshift << endl
         << "Pay Rate: " << getHourlyPayRate << endl;
}

int main () {

    ProductionWorker SystemAdmin ();

    SystemAdmin.setEmployeeName ("Michael Alexander");
    SystemAdmin.setEmployeeNumber ("00685193");
    SystemAdmin.setHireDate ("06/20/2019");
    SystemAdmin.setShift (1);
    SystemAdmin.setHourlyPayRate (30.00);

    SystemAdmin.Print ();

    return 0;
}

这是错误代码

main.cpp: In function ‘int getShift()’:
main.cpp:79:6: error: expected primary-expression before ‘const’
  if (const char * shift == 0)
      ^
main.cpp:79:6: error: expected ‘)’ before ‘const’
main.cpp:80:10: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive]
   return "No Shift.";
          ^
main.cpp:81:11: error: expected primary-expression before ‘const’
  else if (const char * shift == 1) 
           ^
main.cpp:81:11: error: expected ‘)’ before ‘const’
main.cpp:82:10: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive]
   return "Day Shift.";
          ^
main.cpp:83:11: error: expected primary-expression before ‘const’
  else if (const char * shift == 2)
           ^
main.cpp:83:11: error: expected ‘)’ before ‘const’
main.cpp:84:10: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive]
   return "Night Shift.";
          ^
main.cpp:86:10: error: invalid conversion from ‘const char*’ to ‘int’ [-fpermissive]
   return "Error.";
          ^
main.cpp: In function ‘void Print()’:
main.cpp:95:34: error: ‘getemployeeName’ was not declared in this scope
  cout << "Name of Employee: " << getemployeeName << endl
                                  ^
main.cpp:96:33: error: ‘getemployeeNumber’ was not declared in this scope
    << "Employee ID Number: " << getemployeeNumber << endl
                                 ^
main.cpp:97:33: error: ‘gethireDate’ was not declared in this scope
    << "Date of Employment: " << gethireDate << endl
                                 ^
main.cpp:98:20: error: ‘getshift’ was not declared in this scope
    << "Shift: " << getshift << endl
                    ^
main.cpp:99:23: error: ‘getHourlyPayRate’ was not declared in this scope
    << "Pay Rate: " << getHourlyPayRate << endl;
                       ^
main.cpp: In function ‘int main()’:
main.cpp:106:14: error: request for member ‘setEmployeeName’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.setEmployeeName ("Longdy Chea");
              ^
main.cpp:107:14: error: request for member ‘setEmployeeNumber’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.setEmployeeNumber ("00685193");
              ^
main.cpp:108:14: error: request for member ‘setHireDate’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.setHireDate ("06/20/2019");
              ^
main.cpp:109:14: error: request for member ‘setShift’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.setShift (1);
              ^
main.cpp:110:14: error: request for member ‘setHourlyPayRate’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.setHourlyPayRate (30.00);
              ^
main.cpp:112:14: error: request for member ‘Print’ in ‘SystemAdmin’, which is of non-class type ‘ProductionWorker()’
  SystemAdmin.Print ();
              ^

Answer 1

有些错误很容易解决。

void ProductionWorker::Print () {
     ^^^^^^^^^^^^^^^^^^

和

int ProductionWorker::getShift () {
    ^^^^^^^^^^^^^^^^^^

Print和getShift是ProductionWorker类的方法，因此必须这样定义。其他所有方法都可以做到这一点，但是这两种方法都不正确。

也不是

ProductionWorker SystemAdmin ();

但是

ProductionWorker SystemAdmin;

您所写的声明了一个名为SystemAdmin的函数，很明显您确实需要一个名为SystemAdmin的变量。这是一个常见的初学者错误，

不幸的是，还有其他一些难以理解的错误。您显然对轮班和工作日感到困惑。不幸的是，您的代码在这里没有多大意义，除非您可以解释您要做什么，否则我不确定该如何建议。我怀疑您是从几乎正确的代码开始的，但是在尝试对其进行修复时，它变得越来越糟，以至于不再有意义。

错误：“ const”之前的预期主要表达式，错误：“ const”之前的预期“）”

1 个答案: