Challenge: Animal Chorus

Lab C++ Beginner 10 points

Write a base class Animal with a virtual string sound() const, and children Dog (Woof), Cat (Meow) and Cow (Moo). Read a line of animal names and print all their sounds on one line, separated by spaces.

Input

n, then n words (dog, cat or cow).

Output

The sounds, like Woof Meow Woof.

Example

Input

3
dog cat dog

Output

Woof Meow Woof

Sample input available Sample output available

Editor

C++

Hints

Make one object of each kind, and a const Animal* that you point at the right one.

Calling a->sound() runs the child's version because sound() is virtual.

Solution explanation

The pointer's type is Animal*, but because sound() is virtual, the real object decides what is returned.

Show solution

#include <iostream>
#include <string>
#include <vector>
using namespace std;

class Animal {
public:
    virtual string sound() const { return "..."; }
    virtual ~Animal() {}
};

class Dog : public Animal {
public:
    string sound() const override { return "Woof"; }
};

class Cat : public Animal {
public:
    string sound() const override { return "Meow"; }
};

class Cow : public Animal {
public:
    string sound() const override { return "Moo"; }
};

int main() {
    int n;
    cin >> n;
    Dog dog;
    Cat cat;
    Cow cow;
    for (int i = 0; i < n; i++) {
        string word;
        cin >> word;
        const Animal* a = &dog;
        if (word == "cat") a = &cat;
        if (word == "cow") a = &cow;
        if (i > 0) cout << " ";
        cout << a->sound();
    }
    cout << "\n";
    return 0;
}

Output

Answer