如何设置多个对象

Question

void Dog::readDog()
{
    cout << "Name: ";
    cin >> this->name;
    cout << "height: ";
    cin >> this->height;
    cout << "weight: ";
    cin >> this->weight;
    cout << "Color: ";
    cin >> this->color;
}
void Dog::printDog()
{
    cout << "Name: " << this->name << endl;
    cout << "Height: " << this->height << endl;
    cout << "Weight: " << this->weight << endl;
    cout << "Color: " << this->color << endl;
}

int main() {
    Dog dogs;
    int n;
    cout << "Number of dogs to introduce: ";
    cin >> n;
    
    dogs.readDog();
    dogs.printDog();

}

这是我的代码的一部分，我有一个小问题，因为我忘记了如何设置一些我想在程序中引入的狗，例如我想要 3 条狗：Max、Rex、Terry。我的程序只读取和打印一只狗

Answer 1

您可以使用std::vector 创建一个容器，该容器将包含 n 数量的Dog 对象，如下所示：

#include <iostream>
#include <vector>
#include <string>
class Dog 
{
  public:
      void readDog();
      void printDog();
  private:
    std::string name, color;
    double height, weight;
};

void Dog::readDog()
{
    std::cout << "Name: ";
    std::cin >> this->name;
    std::cout << "height: ";
    std::cin >> this->height;
    std::cout << "weight: ";
    std::cin >> this->weight;
    std::cout << "Color: ";
    std::cin >> this->color;
}
void Dog::printDog()
{
    std::cout << "Name: " << this->name << std::endl;
    std::cout << "Height: " << this->height << std::endl;
    std::cout << "Weight: " << this->weight << std::endl;
    std::cout << "Color: " << this->color << std::endl;
}

int main() {
    Dog dogs;
    int n;
    std::cout << "Number of dogs to introduce: ";
    std::cin >> n;
    
    std::vector<Dog> vecDogs(n); //create a vector (of size n) of Dog objects 
    for(int i = 0; i < n; ++i)
    {
        vecDogs.at(i).readDog();
        vecDogs.at(i).printDog();
    }
    
}

std::vector 是一个可变大小的容器，这意味着您可以使用它来拥有n 数量的Dog 对象，其中n 不需要是一个常量表达式。

以上程序的输出可见here。