Question

我刚刚开始学习课程，而且我在使用我的主要成员函数来打印我想要的数据时遇到了困难。这是我得到的错误：

main.cpp：在函数'int main（）'中：错误：请求'd'中的成员'printNumerical'，它是非类型'Date（int，int，int）' d.printNumerical（）; ^

错误：请求'd'中的成员'printMonth'，它是非类型'Date（int，int，int）' d.printMonth（）; ^

错误：在'd'中请求成员'printDateFirst'，这是非类型'Date（int，int，int）' d.printDateFirst（）; ^

这是我的主要内容：

int main ()
{
int Day, Month, Year;

cout << "date information: ";
cin >> Day;
cin >> Month;
cin >> Year;

cout << Day << " " << Month << " " << Year << endl;

Date d (int Day, int Month, int Year);

//where I am having issues
d.printNumerical(); 
d.printMonth();
d.printDateFirst();

return 0;
}

这是我的类定义Date.h

class Date
{
private:
int month,
    day,
    year;

public:
Date(int Day,int Month,int Year); //constructor
Date();                           //constructor if not passed arguments
void printNumerical(); //functions to output in certain format
void printMonthFirst();
void printDateFirst();
};

这是Date.cpp

Date::Date()
{
month = 1;
day = 1;
year = 2001;
}

Date::Date(int Day, int Month, int Year)
{                                        //input validation
if((Month < 1) || (Month > 12) || (Day < 1) || (Day > 31) || (Year < 0)) 
{
month = 1;
day = 1;
year = 2001;
}
else{
        month = Month; //accept passed arguments if valid
        day = Day;
        year = Year;
}
}

void Date::printNumerical()
{
cout << month << "/" << day << "/" << year << endl;
}

void Date::printMonthFirst()
{
switch(month)
{
    case 1 : cout << "January ";
        break;
    case 2 : cout << "February ";
        break;
    case 3 : cout << "March ";
        break;
    case 4 : cout << "April ";
        break;
    case 5 : cout << "May ";
        break;
    case 6 : cout << "June ";
        break;
    case 7 : cout << "July ";
        break;
    case 8 : cout << "August ";
        break;
    case 9 : cout << "September ";
        break;
    case 10 : cout << "October ";
        break;
    case 11 : cout << "November ";
        break;
    case 12 : cout << "December ";
        break;
}
cout << day << ", " ;
cout << year << endl;
}

void Date::printDateFirst()
{
cout << day << " ";
switch(month)
{
    case 1 : cout << "January ";
        break;
    case 2 : cout << "February ";
        break;
    case 3 : cout << "March ";
        break;
    case 4 : cout << "April ";
        break;
    case 5 : cout << "May ";
        break;
    case 6 : cout << "June ";
        break;
    case 7 : cout << "July ";
        break;
    case 8 : cout << "August ";
        break;
    case 9 : cout << "September ";
        break;
    case 10 : cout << "October ";
        break;
    case 11 : cout << "November ";
        break;
    case 12 : cout << "December ";
        break;
}
cout << year << endl;
}

Answer 1

以下一行：

Date d (int Day, int Month, int Year);

实际上是函数的前向声明，它将三个整数作为输入并返回Date个对象。

Date d (Day, Month, Year); // proper construction

Answer 2

您的代码中出现此错误的原因是您以错误的方式对对象d进行了Decalred：在main函数中，尝试用from selenium.webdriver.common.desired_capabilities import DesiredCapabilities runDriver = sys.argv[1] sessionId = sys.argv[2] def setBrowser(): if eval(runDriver): webdriver = w.Remote(command_executor='http://localhost:4444/wd/hub', desired_capabilities=DesiredCapabilities.CHROME, ) else: webdriver = w.Remote(command_executor='http://localhost:4444/wd/hub', desired_capabilities=DesiredCapabilities.CHROME, session_id=sessionId) url = webdriver.command_executor._url session_id = webdriver.session_id print url print session_id return webdriver替换Date d (int Day, int Month, int Year);（或传递任何整数而不是这个）。

好吧，即使在那之后，我注意到你的程序中会有另一个编译时错误。您已调用Date d (1,1,2001);（在main（）中），该类在该类中不存在。我想你想打电话给d.printMonth()。

我希望这能解决问题。祝你好运！

成员的错误请求，非类型类型Date（int，int，int）

2 个答案: