物件陣列與初始化

物件陣列與初始化 筆記
若想要以非物件的預設建構子去初始化一個物件陣列時
要怎麼做呢
請參考底下的程式碼

#include 
#include 
#include 
#include 

using namespace std;

class car {
 int price;
 string name;
public:
 //car():price(100), name("ford"){}
 car();
 car(int, string);
 void show();
};

car::car()
{
 price = 100;
 name = "ford";
}

car::car(int i, string str)
{
 price = i;
 name = str;
}

void car::show()
{
 cout << price << " " << name << endl;
}

int main()
{
    car car1, car2(120, "bmw");

 //default constructor
    car1.show();
    //initial by manual
    car2.show();
 //object array and initial by manual
 car car3[5] = {car(1, "bmw z1"), car(2, "bmw z2"), car(3, "bmw z3"),
         car(4, "bmw z4"), car(5, "bmw z5")};
 //using vector to create 101 objects with the same value
 vector car4;


    for(int i = 0; i != 5; i++) {
  car3[i].show();
 }
 for(int i = 0; i != 10; ++i) {
  car4.push_back(car2);
  car4[i].show();
 }

 //The following two ways are wrong!
 //car *ptr = new car(111, "benz")[3];
 //car *ptr = new car[3](111, "benz");

    return 0;
}

輸出結果如下：
100 ford
120 bmw
1 bmw z1
2 bmw z2
3 bmw z3
4 bmw z4
5 bmw z5
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw
120 bmw

結論是用 car array_car[5](1, "xx")
或是 car array_car(1,"xx")[5] 都是錯的 Orz