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#include <iostream>
#include <stack>
using namespace std;
int main()
{
stack<int> stack1;
stack1.push(1);
stack1.push(2);
int &data = stack1.top();
stack1.pop();
cout<<data<<endl;//输出2
data = stack1.top();
stack1.pop();
cout<<data<<endl;//输出-572662307
return 0;
}
#include <iostream>
using namespace std;
int main()
{
int a = 1;
int & b = a;
b = 2;
cout << a << '\n' << b << '\n';
return 0;
}