c++ - 在运行时更改用类对象填充的数组的大小 C++

Question

我有一个类必须存储动物的重量及其类型。 根据用户的需要，可以在运行时创建尽可能多的该类实例。 我的问题是无法正确声明一个动态数组，一旦整个数组都充满了对象，它就可以自行调整大小。

class FarmAnimal
{

private:
    short int type;
    int weight;
    double WaterConsumed;



public:
    static int NumberOfSheep;
    static int NumberOfHorse;
    static int NumberOfCow ;
    static double TotalWaterUsed;

    FarmAnimal(int type, int weight)
    {
        this->type = type;
        this->weight = weight;
    }
        int CalculateWaterConsumption(void);
        void ReturnFarmInfo(int& NumberOfSheep, int& NumberOfHorse, int& NumberOfCow, int& TotalWaterUsed)
};

int main()
{
...
short int k;
...
do
{
...

FarmAnimal animal[k](TypeOfAnimal, weight);
        k++;
        cout << "Would you like to add another animal to your farm?\n Press\"0\" to exit and anything else to continue" << endl;
        cin >> ExitButton;
    } while (ExitButton != 0)

程序结束

            animal[0].ReturnFarmInfo(NumberOfSheep, NumberOfHorse, NumberOfCow, TotalWaterUsed)

    cout << " Your farm is made up of :" << NumberOfSheep << " sheeps " << NumberOfHorse" horses " << NumberOfCow << " cows " << endl;
    cout << "The total water consumption on your farm per day is: " << TotalWaterUsed << endl;
}

Answer 1

数组在 C++ 中不能改变大小。您需要使用动态容器，例如 std::vector。可以找到 vector 类的文档 here .

std::vector<FarmAnimal> animals;

bool done = false;
while (!done)
{
    animals.push_back(FarmAnimal(TypeOfAnimal, weight));
    cout << "Would you like to add another animal to your farm?\n Press\"0\" to exit and anything else to continue" << endl;
    cin >> ExitButton;
    done = (ExitButton != 0);
}