c/c++ reference tips

A reference is to create a new alias for a certain variable, and the operation on the reference is the operation on its variable;

int &a=b; //Define reference a, which is the reference name of variable b, that is, it is also an alias

1. Reference method variable type +&+reference name = target variable name; 

2. When declaring a reference, it must be initialized. Once initialized, it cannot point to other variables, nor can it point to a null value.

3. Declaring a reference is not a new definition of a variable. It is just a reference name and an alias of the variable (a reference name is only used as a reference to a variable). It will open up additional space and occupy memory! ! ! !

4. To find the address of a reference is to find the address of a variable (&a=&b)

#include<iostream>
using namespace std;
int main() {
    int a = 1;
    int b = 2;
    int& p = a;
    cout << &a << endl;
    cout << &p << endl;
    p = b;//引用对象没有改变只是把b的值赋给了a
    cout << &b<< endl;
    cout << &p << endl;
    cout << a << endl;//a的值变成了2
    /*p = nullptr;
    cout << p << endl;*/

    return 0;
}

Record it yourself, for reference only. If you have any questions, please leave a message~