C++引用和指针

引用和指针的差别

引用总是指向某个对象，定义引用时没有初始化是错误的

赋值行为差异，给引用赋值修改的是该引用所关联对象的值，而不是使引用与另一个对象关联

#include<iostream>
using namespace std;
int main()
{
    int ival = 1024, ival2= 2048;
    int *pi=&ival, *pi2 = &ival2;
    cout<<"--before
ival = "<<ival<<"  ival2 ="<<ival2<<endl;
    cout<<"pi = "<<*pi<<"  pi2 = "<<*pi2<<endl;
    //指针赋值
    pi=pi2;
    cout<<"--after
ival = "<<ival<<"  ival2 ="<<ival2<<endl;
    cout<<"pi = "<<*pi<<"  pi2 = "<<*pi2<<endl;
    int &ri = ival,&ri2= ival2;
    cout<<"--before
ival = "<<ival<<"  ival2 ="<<ival2<<endl;
    cout<<"ri = "<<ri<<"  ri2 = "<<ri2<<endl;
    //指针赋值
    ri=ri2;
    cout<<"--after
ival = "<<ival<<"  ival2 ="<<ival2<<endl;
    cout<<"ri = "<<ri<<"  ri2 = "<<ri2<<endl;
    cin.get();
    return 0;
}