#include <iostream>
#include <cstring>
#include <vector>

using namespace std;

// forward declaration
class OOPMP;

class Song
{
private:
    char *name;
    char *lyrics;

protected:
    virtual void privatePlay()
    {
        play();
    }

public:
    Song(const char *name, const char *lyrics)
    {
        // Allocate memory
        this->name = new char[strlen(name) + 1];
        this->lyrics = new char[strlen(lyrics) + 1];

        // copy strings
        strcpy(this->name, name);
        strcpy(this->lyrics, lyrics);
    }

    const char *getName()
    {
        return name;
    }

    const char *getLyrics()
    {
        return lyrics;
    }

    ~Song()
    {
        delete[] name;
        delete[] lyrics;
    }

    virtual void play() = 0;

    friend OOPMP;
};

class MP3 : public Song
{
    char *type;

public:
    MP3(const char *name, const char *lyrics, const char *type) : Song(name, lyrics)
    {
        this->type = new char[strlen(type) + 1];
        strcpy(this->type, type);
    }

    virtual void play()
    {
        cout << "TYPE:\n";
        cout << type << '\n';
        cout << "LYRICS:\n";
        cout << getLyrics() << "\n\n";
    }

    ~MP3()
    {
        delete[] type;
    }
};

class MP4 : public Song
{
    char *video;

public:
    MP4(const char *name, const char *lyrics, const char *video) : Song(name, lyrics)
    {
        this->video = new char[strlen(video) + 1];
        strcpy(this->video, video);
    }

    const char *getVideo()
    {
        return video;
    }

    void play()
    {
        cout << "LYRICS:\n";
        cout << getLyrics() << '\n';
        cout << "VIDEO:\n";
        cout << video << "\n\n";
    }

    ~MP4()
    {
        delete[] video;
    }
};

class sMP4 : public MP4
{
protected:
    virtual void privatePlay()
    {
        MP4::play();
    }

public:
    sMP4(const char *name, const char *lyrics, const char *video) : MP4(name, lyrics, video) {}
    
    void play()
    {
        cout << "Lyrics:\nbleeeeeeep\n";
        cout << "Video:\nglitchhhh\n\n";
    }
};

class OOPMP
{
    vector<Song*> songs;

public:
    void addToPlayList(Song *song)
    {
        songs.push_back(song);
    }

    void playAll()
    {
        for (Song *song : songs)
        {
            cout << "Currently Playing: " << song->getName() << endl;
            song->privatePlay();
        }
    }
};

int main()
{
    /*Creating MP3 song, arguments are 
    name of song, lyrics and type*/
    MP3 *s1 = new MP3("Happy",
                      "Because I am happy...",
                      "pop");

    // play s1, it will just print the lyrics
    s1->play();

    /*Creating MP4 song, 
    arguments are name of song, 
    lyrics and description of video*/
    MP4 *s2 = new MP4("Happy",
                      "Because I am happy...",
                      "A man walking..");
    s2->play();

    /*Creating sMP4 song, arguments are 
    name of song, lyrics and description of video*/
    sMP4 *s3 = new sMP4("Born Free",
                      "Born free...",
                      "Different pictures\nappearing on screen...");

    // play s1, it will just print the lyrics
    s3->play();         /*note that playing song of sMP4
                        does not show real lyrics and video*/

    // Creating a music player of type OOPMP
    OOPMP myPlayer;

    // Adding songs to OOPMP
    myPlayer.addToPlayList(s1);
    myPlayer.addToPlayList(s2);
    myPlayer.addToPlayList(s3);

    /*invoking member functions to play all songs in playlist
    note that now sMP4 song shows the real lyrics and video*/
    myPlayer.playAll();

    return 0;
}

C++ Online Compiler

Write, Run & Share C++ code online using OneCompiler's C++ online compiler for free. It's one of the robust, feature-rich online compilers for C++ language, running on the latest version 17. Getting started with the OneCompiler's C++ compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as C++ and start coding!

Read inputs from stdin

OneCompiler's C++ online compiler supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample program which takes name as input and print your name with hello.

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

int main() 
{
    string name;
    cout << "Enter name:";
    getline (cin, name);
    cout << "Hello " << name;
    return 0;
}

About C++

C++ is a widely used middle-level programming language.

  • Supports different platforms like Windows, various Linux flavours, MacOS etc
  • C++ supports OOPS concepts like Inheritance, Polymorphism, Encapsulation and Abstraction.
  • Case-sensitive
  • C++ is a compiler based language
  • C++ supports structured programming language
  • C++ provides alot of inbuilt functions and also supports dynamic memory allocation.
  • Like C, C++ also allows you to play with memory using Pointers.

Syntax help

Loops

1. If-Else:

When ever you want to perform a set of operations based on a condition If-Else is used.

if(conditional-expression) {
   //code
}
else {
   //code
}

You can also use if-else for nested Ifs and If-Else-If ladder when multiple conditions are to be performed on a single variable.

2. Switch:

Switch is an alternative to If-Else-If ladder.

switch(conditional-expression){    
case value1:    
 // code    
 break;  // optional  
case value2:    
 // code    
 break;  // optional  
......    
    
default:     
 code to be executed when all the above cases are not matched;    
}

3. For:

For loop is used to iterate a set of statements based on a condition.

for(Initialization; Condition; Increment/decrement){  
  //code  
}

4. While:

While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.

while (condition) {  
// code 
}

5. Do-While:

Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.

do {  
 // code 
} while (condition);

Functions

Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity. Function gets run only when it is called.

How to declare a Function:

return_type function_name(parameters);

How to call a Function:

function_name (parameters)

How to define a Function:

return_type function_name(parameters) {  
 // code
}