c++ new 和delete的使用

最新推荐文章于 2023-05-13 23:06:49 发布

dxm809

最新推荐文章于 2023-05-13 23:06:49 发布

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分类专栏： C++

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#include <iostream>	

using namespace std;

class  Teacher
{
public:
	Teacher(int age)
	{
		m_Age = age;
	 }

	void SetAge(int  age)
	{
		m_Age = age;
	}

	int GetAge()
	{
		return m_Age;
	}
	~ Teacher(){}

private:
	int m_Age;
};



int main()
{
	//new 会执行构造函数 molloc不会
	//delete 会执行析构函数 free不会

	//C语言
	/*int* p = (int*)malloc(sizeof(int));
	*p = 100;
	printf("p:%d", *p);*/

	//c++
	int* p2 = new int;
	*p2 = 20;
	cout << *p2 << endl;
	delete(p2);

	int* p3 = new int(30);
	cout<<*p3<<endl;
	delete(p3);

	//C
	int* p4 = (int*)malloc(sizeof(int) * 10); //int arr[10]
	p4[0] = 10;
	free(p4);

	//C++
	int* p5 = new int[10];
	p5[0] = 10;
	cout << p5[0] << endl;
	delete[](p5);

	//C
	Teacher* t1 = (Teacher*)malloc(sizeof(Teacher));
	t1->SetAge(20);
	cout << t1->GetAge() << endl;
	delete(t1);

	//C++
	Teacher* t2 = new Teacher(30);
	cout << t2->GetAge() << endl;
	delete(t2);
}