C++之&与*符号用法案例详解

#include<iostream>
#include<string>
using namespace std;
int main()
{
	int a = 5, b = 10, c = 15;
	int *p1;	//指针可以不初始化
	int &d = b;	//引用必须初始化（相当于给一个人起外号要针对那个人）
	p1 = &a;	//p1指向a的地址
	cout << "a:" << a << endl << "a的地址:" << &a << endl ;
	cout << "b:" << b << endl << "b的地址:" << &b << endl;
	cout << "c:" << c << endl << "c的地址:" << &c << endl;
	cout << "p1(的地址):" << p1 << endl << "p1所指对象:" << *p1 << endl;
	cout << "d:" << d << endl << "d的地址:" << &d << endl;
	d = c;		//相当于b=d=c;
	p1 = &c;	//p1指向c的地址
	cout << endl <<"修改后：" << endl<<endl;
	cout << "a:" << a << endl << "a的地址:" << &a << endl;
	cout << "b:" << b << endl << "b的地址:" << &b << endl;
	cout << "c:" << c << endl << "c的地址:" << &c << endl;
	cout << "p1:" << p1 << endl << "p1所指对象:" << *p1 << endl;
	cout << "d:" << d << endl << "d的地址:" << &d << endl;
	system("pause");
	return 0;
}

int i=4;
int *p=&i;

int a = 5, b = 10;
int *p;
p = &a;
p = &b;		//p指向b(取b的地址)
*p = 2;		//*p相对于b，即b=2