Coding With Joseph

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C++ Quiz #40

Accidental Method Signature Mismatch

mediumPolymorphism

The programmer expects this to print "Derived: 42", but it prints "Base: 42" instead. What is the bug?

📄 Code

1#include <iostream>
2using namespace std;
3 
4class Base {
5public:
6    virtual void process(int x) {
7        cout << "Base: " << x << endl;
8    }
9    virtual ~Base() {}
10};
11 
12class Derived : public Base {
13public:
14    void process(int x) const {  // note: const added
15        cout << "Derived: " << x << endl;
16    }
17};
18 
19int main() {
20    Base* b = new Derived();
21    b->process(42);
22    delete b;
23    return 0;
24}