引用

#include<bits/stdc++.h>
using namespace std;
/**
 * 
 * */
int main() {
    int i = 9;
    int &ir = i;
    cout<<"i="<< i << "\t" << "ir=" << ir <<endl;
    ir = 20;
    cout<<"i="<< i << "\t" << "ir=" << ir <<endl;
    i = 12;
    cout<<"i="<< i << "\t" << "ir=" << ir <<endl;
    cout<<"address i:"<< &i <<endl;
    cout<<"address ir:"<<&ir<<endl;
    return 0;
}

输出

i=9     ir=9
i=20    ir=20
i=12    ir=12
address i:0x61fef8
address ir:0x61fef8

引用和指针的区别

#include<bits/stdc++.h>
using namespace std;
/**
 * 引用注意事项
 * */
int main() {
    int i = 0, a[10] = {0};
    // int &*ip = i; // 错误，不能建立指向引用的指针
    int *pi = &i;
    int *&pr = pi; // pi指针的引用pr
    *pr = 10;
    cout<<"i="<<i<<endl;
    return 0;
}