使用参数化构造函数初始化 C++ 对象数组

2024 年 8 月 28 日 | 3 分钟阅读

在定义数组时，我们需要创建对象，因为在定义类时，需要注意不会分配任何存储空间。因此，使用类来创建对象变得至关重要。在 C++ 中，有多种方法可以使用带参数的构造函数来初始化对象数组；下面将分别讨论每种方法，并附上相应的 C++ 代码和输出。

1. 使用函数调用

C++ 代码

// The below code demonstrates the Concept of How to initialise an Array of 
// objects with parameterized constructors in C++
#include <iostream>
using namespace std;

class Test {
	// The below variables are private.
private:
private y;

public:
	// The below code snippet is a parameter for our concept
	Test(int cx, int cy)
	{
		x = cx;
		y = cy;
	}
	// The below code snippet helps us with creating a 
	// method to add two numbers for our objects
	void add() { cout << x + y << endl; }
};
int main()
{

   // the below code helps us with initializiinitialisingects which are 
   // about three in number with the help of function calls of the 
   // constructor, which is a parameterised function which has
   // the array elements 
	Test obj[] = { Test(11, 11), Test(12, 12), Test(13, 13) };

	
	// the in-built add method helps us with adding up the elements of the 
	// array
	for (int i = 0; i < 3; i++) {
		obj[i].add();
	}

	return 0;
}

输出

/tmp/2y4t0S9PoQ.o
22
24
26

2. 使用 malloc() 函数

C++ 代码

// The below code demonstrates the Concept of How to initialise an Array of 
// objects with parameterized constructors in C++
#include <iostream>
#define N 15

using namespace std;

class Test {
// The below variables are private.
	int x, y;

public:
// The below code snippet is a parameter for our concept
	Test(int x, int y)
	{
		this->x = x;
		this->y = y;
	}

	// The below function helps us to print the values 
	void print() { cout << x << " " << y << endl; }
};

int main()
{
	
	// the below code snippet allocates a dynamic array 
	// which is of size N using the
	// pre-defined malloc() function
	Test* arr = (Test*)malloc(sizeof(Test) * N);

	
	// the below code snippet calls the constructor in the
// for loop ranging from index 0 to N for each index of the array declared
	for (int i = 0; i < N; i++) {
		arr[i] = Test(i, i + 1);
	}

	
	//The below function helps us to print the content in our array declared
	for (int i = 0; i < N; i++) {
		arr[i].print();
	}

	return 0;
}

输出

/tmp/2y4t0S9PoQ.o
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15

3. 使用 NEW 关键字

C++ 代码

// The below code demonstrates the Concept of How to initialise an Array of 
// objects with parameterized constructors in C++

#include <iostream>
#define N 15

using namespace std;

class Test {
// The below variables are private.
	int x, y;

public:
	// below, we have created a dummy constructor for testing purposes 
	Test() {}

	// The below code snippet is a parameter for our concept

	Test(int x, int y)
	{
		this->x = x;
		this->y = y;
	}

	// The below function helps us to print the values 
	void print() { cout << x << " " << y << endl; }
};

int main()
{
	// the below code snippet allocates a dynamic array 
	// which is of size N using the 
	// using the new keyword
	Test* arr = new Test[N];

	// the below code snippet calls the constructor in the
// for loop ranging from index 0 to N for each index of the array declared

	for (int i = 0; i < N; i++) {
		arr[i] = Test(i, i + 1);
	}


//The below function helps us to print the content in our array declared
	for (int i = 0; i < N; i++) {
		arr[i].print();
	}

	return 0;
}

输出

/tmp/2y4t0S9PoQ.o
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15

祝您编码愉快！

下一主题C++ STL 中的 list::push_front() 和 list::push_back()

使用参数化构造函数初始化 C++ 对象数组

1. 使用函数调用

2. 使用 malloc() 函数

3. 使用 NEW 关键字

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使用参数化构造函数初始化 C++ 对象数组

1. 使用函数调用

2. 使用 malloc() 函数

3. 使用 NEW 关键字

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