#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;
}
