指针和二级指针的区别

最新推荐文章于 2025-04-15 12:03:08 发布

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本文通过具体的C++代码示例，详细介绍了指针与二级指针的概念及其使用方法。通过实例演示了如何利用指针及二级指针来操作变量，并展示了不同级别的指针在内存中指向的不同层次。

如：

int a = 10;

int* pt = &a;

指针是对普通变量的操作；

等同与：

int* a = 10;

int** pt = &a;

二级指针是对指针的操作。

void test()
{
	int a = 10;
	int* pt = &a;
	int** ppt = &pt;
	
	cout << "a = " << a << endl;
	cout << "*pt = " << *pt << endl;
	cout << "**ppt = " << **ppt << endl;
	
	cout << "change the Value : a= 20" << endl<<endl;
	a = 20;
	
	cout << "a = " << a << endl;
	cout << "*pt = " << *pt << endl;
	cout << "**ppt = " << **ppt << endl;
	
	cout << "change the Value : *pt= 30" << endl<<endl;
	*pt = 30;
	
	cout << "a = " << a << endl;
	cout << "*pt = " << *pt << endl;
	cout << "**ppt = " << **ppt << endl<<endl;
	
	cout << "change the Value : **ppt= 40" << endl;
	**ppt = 40;
	
	cout << "a = " << a << endl;
	cout << "*pt = " << *pt << endl;
	cout << "**ppt = " << **ppt << endl<<endl;
}

a = 10
*pt = 10
**ppt = 10
change the Value : a= 20

a = 20
*pt = 20
**ppt = 20
change the Value : *pt= 30

a = 30
*pt = 30
**ppt = 30

change the Value : **ppt= 40
a = 40
*pt = 40
**ppt = 40