For (Auto A: b) and for (Auto & A: b) usage

The difference between the two usages

• for(auto a:b) in b For a container , The effect is to use a Traverse and get b Every value in the container , however a Can't affect b Elements in the container .
• for(auto &a:b) A reference symbol is added in the , You can assign values to the contents of the container , Through a Assignment to do container b Fill in the content of .

Test code

#include<iostream>
 
using namespace std;
 
int main()
 
{ 
    
    int i[10]