指针

#include <iostream>
using namespace std;
int main(){
	int a=10;
	int *p;//声明指针 
	p=&a;//将指针p指向变量a的内存地址 
	cout<<"a的值"<<a<<endl;
	cout<<"a的内存地址"<<p<<endl;
	*p=300;
	cout<<"a的值"<<a<<endl;
	cout<<"指针p指向的内存地址的值"<<*p; 
}