单选题库

void processData() {
    stack<int> s;
    queue<int> q;
    for (int i = 1; i <= 5; ++i) {
        s.push(i);
        q.push(i);
    }
 
    while (!s.empty()) {
        cout << "Stack pop: " << s.top() << endl;
        s.pop();
    }
 
    while (!q.empty()) {
        cout << "Queue pop: " << q.front() << endl;
        q.pop();
    }
}

#include <iostream>
using namespace std;
class MyClass {
public:
    MyClass() {
        cout << "Constructor called!" << endl;
    }
    void display() {
        cout << "Display function called!" << endl;
    }
};
int main() {
    MyClass* obj = NULL;
    obj->display();
    return 0;
}