①值传递

②地址传递

#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
struct stu
{int age;string name;
};
void printStu(stu a)
{cout << a.age << ' ' << a.name << endl;
}
void printstu(stu* p)
{cout << p->age << ' ' << p->name << endl;
}
int main()
{	stu x = { 22,"adele" };printStu(x);printstu(&x);}