Virtual Base Classes (virtual public)

Medium Multiple & Virtual Inheritance

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Problem Statement

Fix the diamond problem! Modify `Printer` and `Scanner` to inherit `virtual public` from `Device`. `Copier` inherits from both. Now `Copier` has only ONE shared instance of `power`. Read an integer, assign it directly to `Copier`’s `power` (no scope resolution needed), and print it.

Input Format

A single integer.

Output Format

Print 'Shared Power: [val]'.

Constraints

None

Sample Input

Sample Output

Shared Power: 220

Explanation

Virtual inheritance ensures only one copy of the base class is shared across the hierarchy, preventing ambiguity.

Starter Code

#include <iostream>

class Device {
public:
    int power;
};

// Use virtual public inheritance here
class Printer {};
class Scanner {};
class Copier : public Printer, public Scanner {};

int main() {
    int p;
    // Read p, assign directly, and print
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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