c++中对象数组的初始化

C ++对象的动态初始化 (C++ Dynamic Initialization of Objects)

The Dynamic Initialization of Objects means to initialize the data members of the class while creating the object. When we want to provide initial or default values to the data members while creating of object - we need to use dynamic initialization of objects.

动态初始化对象意味着在创建对象时初始化类的数据成员。 当我们要在创建对象时为数据成员提供初始值或默认值时，我们需要使用对象的动态初始化 。

Now, the question is how to achieve or implement dynamic initialization of objects?

现在，问题是如何实现或实现对象的动态初始化 ？

It can be implemented by using parameterized constructors in C++.

可以通过使用C ++中的参数化构造函数来实现。

Example:

例：

Here, we have a class named "Student" which contains two private data members 1) rNo - to store roll number and 2) perc - to store percentage.

在这里，我们有一个名为“学生”，其中包含两个私有数据成员1)RNO类-存储卷号和2)PERC -存储百分比。

Program:

程序：

#include 
    
     using namespace std;//structure definition with private and public membersstruct Student {private:    int rNo;    float perc;public:    //constructor    Student(int r, float p)    {        rNo = r;        perc = p;    }    //function to read details    void read(void)    {        cout << "Enter roll number: ";        cin >> rNo;        cout << "Enter percentage: ";        cin >> perc;    }    //function to print details    void print(void)    {        cout << endl;        cout << "Roll number: " << rNo << endl;        cout << "Percentage: " << perc << "%" << endl;    }};//Main codeint main(){    //reading roll number and percentage to initialize    //the members while creating object    cout << "Enter roll number to initialize the object: ";    int roll_number;    cin >> roll_number;    cout << "Enter percentage to initialize the object: ";    float percentage;    cin >> percentage;    //declaring and initialize the object    struct Student std(roll_number, percentage);    //print the value    cout << "After initializing the object, the values are..." << endl;    std.print();    //reading and printing student details    //by calling public member functions of the structure    std.read();    std.print();    return 0;}
    

Output

输出量

Enter roll number to initialize the object: 101Enter percentage to initialize the object: 84.02After initializing the object, the values are...Roll number: 101Percentage: 84.02%Enter roll number: 102Enter percentage: 87Roll number: 102Percentage: 87%

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c++中对象数组的初始化