Object-Oriented Programming · Question 28 · Hard
What is the output of the following C++ program?
#include <iostream>
using namespace std;
class Account {
public:
virtual void show() { cout << "Account"; }
};
class Savings : public Account {
public:
void show() override { cout << "Savings"; }
};
void print(Account a) { a.show(); }
int main() {
Savings s;
print(s);
return 0;
}- Savings
- Compilation error
- Account
- AccountSavings
Answer and explanation
Answer: C. Account
Explanation: print takes its parameter by value, so the Savings object is copied into a plain Account object (object slicing). The copy really is an Account, so even the virtual call prints Account. Passing by reference (Account&) would print Savings.
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