#include<iostream>
#include<string>
using namespace std;//发现是引用，转换为int* const ref = &a;void func(int& ref) {ref = 100; // ref是引用，转换为*ref = 100}int main() {int a = 10;//自动转换为int* const ref = &a; 指针常量是指针指向不可改，也说明为什么引用不可更改int &ref = a;ref = 20; //内部发现ref是引用，自动帮我们转换为: *ref ■20;cout << "a:" << a << endl;cout << "ref:" << ref << endl;func(a);return 0;}