如何在类中使用指针 [英] how to use a pointer in a Class

问题描述

我有以下程序可以正常工作，但我想知道我是否可以替换使用new operator的以下行 NumDays * days = new NumDays（）;

使用另一个更容易兼容的C ++命令。



我问这个问题因为这对我来说比Java更像是一个Java命令而不是C ++



< pre lang =c ++> int main（）{
NumDays * days = new NumDays （）;
double 小时;
cout<< 输入工作小时数并获得工作日。\ n;
cout<< 输入0以终止序列。\ n;


while （ true ）{
cout << 输入小时数<< ENDL;
cin>>小时;

if （小时< 0 ）{
cout< ;< 输入无效。请重试。<< ENDL;
继续;
}
如果（小时== 0 ）{
cout << 退出...<< endl;
break ;
}
days-> setWorkingHours（小时）;
cout<<小时<< 工作时间为<< days-> getDays（）<< 工作日。<< endl;

解决方案

您可以在堆栈上分配 NumDays 变量;

 NumDays天; 

这也意味着你必须改变你在<$上引用方法的方式c $ c>天;

 days-> setWorkingHours（小时）; 

成为

 days.setWorkingHours（小时）; 

希望这会有所帮助

Fredrik

I have the following program that works fine but I want to know if I can replace just the following line that use the " new operator " NumDays *days = new NumDays();
with another easier compatible C++ command.

I am asking this question because this resemble more to me a Java command than a C++

int main() {
    NumDays *days = new NumDays();
    double hours;
    cout << "Enter numberof hours worked and get working days.\n";
    cout<< "Enter 0 to terminate the sequence. \n";


    while (true) {
        cout << "Enter number of hours" << endl;
        cin >> hours;

        if (hours < 0) {
            cout << "Invalid input. Please try again." << endl;
            continue;
        }
        if (hours == 0) {
            cout << "Exiting..." <<endl;
            break;
        }
        days->setWorkingHours(hours);
        cout << hours << " working hours is " << days->getDays() << " working days." << endl;

解决方案

You could allocate the NumDays variable on the stack;

NumDays days;

That would also mean you would have to change the way you reference methods on days;

days->setWorkingHours(hours);

becomes

days.setWorkingHours(hours);

Hope this helps
Fredrik

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