Question

CS 52 Assignment 5

Project 2 - Record Player

write C++

Following the class diagram shown below, create the class RecordPlayer. An RecordPlayerrepresents a stereo component that can play vinyl records. Please review the class and the sample driver code. There is a specific order to the way the class methods should be called. In other words, you can’t plop the Needle unless there actually is a record on the player and the recordplayeris turned on. You also can’t return the Needle unless there is actually a record on the player and the recordplayeris turned on. Your class should enforce these rules and write errors to cout as they occur. A sample driver for this class is shown below.

Rules of the record player

1. You can affix a platter if the record player is on or off and the needle is not ploped
2. Record player must be on and must have record affixed to the platter to plop the needle on the record
3. Can only return the needle if the record player is on and there is a record on the player
4. Performing the same action twice results in a “no-op” where nothing changes. For example, you can’t plop an already plopped needle, and you can’t return a needle that’s already returned. Another example: you can’t turn on/off a record player that is already on

Please note: codeboard must test differently for this project. There is no input. The provided driver will be called automatically. Your code will not compile when you start the project; only when you’ve implemented the RecordPlayer class will it compile successfully.

Record Player

RecordPlayer( );

void turnOn( );
void turnOff( );
bool isPoweredOn( );
void affixPlatter( string record );
void plopNeedle( );
void returnNeedle( );


bool isOn;
string record;
bool needleIsOnTheRecord;

Record Player Sample Driver Code

//declare 6 RecordPlayers
RecordPlayer good_r, bad_r1, bad_r2, bad_r3, bad_r4, bad_r5;

//first test correct
good_r.turnOn();
good_r.affixPlatter("Barrow Manila I");
good_r.plopNeedle();
good_r.returnNeedle();
good_r.turnOff();

//bad test, plops needle without turning it on or putting record on
bad_r1.plopNeedle();

//turns it on but no record on platter
bad_r2.turnOn();
bad_r2.plopNeedle();

//not on nor has album on platter
bad_r3.returnNeedle();

//turned on but no album
bad_r4.turnOn();
bad_r4.returnNeedle();

//not turned on
bad_r5.affixPlatter("Barrow Manila I");
bad_r5.plopNeedle();

Record Player Sample Driver Code Output

Record player is turned on
Record Barrow Manila I is now on the platter
Needle is placed on the record
Needle is returned from the record
Record player is turned off
Cannot place needle on the record
Record player is turned on
Cannot place needle on the record
Cannot return needle from the record
Record player is turned on
Cannot return needle from the record
Record Barrow Manila I is now on the platter
Cannot place needle on the record

Answer 1

Working code implemented in C++ and appropriate comments provided for better understanding:

Here I am attaching code for these 3 files:

• main.cpp
• record_player.cpp
• record_player.h

Source code for main.cpp:

// include necessary files
#include <iostream>
#include "record_player.h"

using namespace std;

int main()
{
// declare 6 RecordPlayers
RecordPlayer good_r, bad_r1, bad_r2, bad_r3, bad_r4, bad_r5;

// first test correct
good_r.turnOn();
good_r.affixPlatter("Barrow Manila I");
good_r.plopNeedle();
good_r.returnNeedle();
good_r.turnOff();

// bad test, plops needle without turning it on or putting record on
bad_r1.plopNeedle();

// turns it on but no record on platter
bad_r2.turnOn();
bad_r2.plopNeedle();

// not on nor has album on platter
bad_r3.returnNeedle();

// turned on but no album
bad_r4.turnOn();
bad_r4.returnNeedle();

// not turned on
bad_r5.affixPlatter("Barrow Manila I");
bad_r5.plopNeedle();

// exit cleanly
return 0;
}

Code Screenshots:

1 // include necessary files 2 #include <iostream> 3 #include "record_player.h" 4 5 using namespace std; 6 7 int main() 8 { 9 // declare 6 Recordplayers 10 Recordplayer good_r, bad_r1, bad_r2, bad_r3, bad_r4, bad_r5; 11 12 // first test correct 13 good_r.turnon(); 14 good_r-affixPlatter("Barrow Manila I"); 15 good_r.plopNeedle(); 16 good_r.returnNeedle(); 17 good_r.turnoff(); 18 // bad test, plops needle without turning it on or putting record on bad_r1.plopNeedle(); 21 I turns it on but no record on platter 23 bad_r2.turnon(); bad_r2.plopNeedle(); 26 // not on nor has album on platter 27 bad_r3.returnNeedle(); 28 29 // turned on but no album 30 bad_r4.turnon(); 31 bad_r4.returnNeedle(); 32 33 // not turned on 34 bad_r5.affixPlatter("Barrow Manila I"); 35 bad_r5.plopNeedle(); 36 37 // exit cleanly 38 return 0; 39 } 19 20 22 24 25

Source code for record_player.cpp:

#include "record_player.h"

RecordPlayer::RecordPlayer()
{
record = "";
isOn = false;
needleIsOnTheRecord = false;
}

void RecordPlayer::turnOn()
{
isOn = true;
cout << "Record player is turned on" << endl;
}

void RecordPlayer::turnOff()
{
isOn = false;
cout << "Record player is turned off" << endl;
}

bool RecordPlayer::isPoweredOn()
{
return isOn;
cout << "Record player is powered on" << endl;
}

void RecordPlayer::affixPlatter(string r)
{
record = r;
cout << "Record " << record << " is now on the platter" << endl;
}

void RecordPlayer::plopNeedle()
{
if (record != "" && isOn)
{
needleIsOnTheRecord = true;
cout << "Needle is placed on the record" << endl;
}
else
{
cout << "Cannot place needle on the record" << endl;
}
}

void RecordPlayer::returnNeedle()
{
if (record != "" && isOn)
{
needleIsOnTheRecord = false;
cout << "Needle is returned from the record" << endl;
}
else
{
cout << "Cannot return needle from the record" << endl;
}
}

Code Screenshots:

نها 1 #include "record_player.h" 2 3 Recordplayer:: RecordPlayer() 4 { 5 record = ""; 6 ison false; 7 needle IsOnTheRecord false; 8 } 9 10 void RecordPlayer::turnon() 11 { 12 ison = true; 13 cout << "Record player is turned on" << endl; 14 15 16 void Recordplayer::turnoff) 17 V { 18 ison = false; 19 cout << "Record player is turned off" << endl; 20 } 21 22 bool RecordPlayer::isPoweredon() 23 { 24 return ison; 25 cout << "Record player is powered on" << endl; 26 } 27 28 void RecordPlayer::affixPlatter(string r) 29 { 30 record = r; 31 cout << "Record << record << is now on the platter" << endl; 32 } 33 34 void RecordPlayer::plopNeedle() 35 V { 36 if (record != && ison) 37 38 needleIsOnTheRecord = true; 39 cout << "Needle is placed on the record" << endl; 40 } else 42 { 43 cout << "Cannot place needle on the record" << endl; 44 } 45 } 46 47 void RecordPlayer::returnNeedle() 48 49 if (record ! && ison) 50 { 51 needleIsOnTheRecord = false; 52 cout << "Needle is returned from the record" << endl; 53 } 54 else 55 56 cout << "Cannot return needle from the record" << endl; 57 58 } 59 { 41 { { مها

Source code for record_player.h:

#include <iostream>
#include <string>

using namespace std;

class RecordPlayer
{
public:
RecordPlayer();
void turnOn();
void turnOff();
bool isPoweredOn();
void affixPlatter(string r);
void plopNeedle();
void returnNeedle();

private:
bool isOn;
string record;
bool needleIsOnTheRecord;
};

Code Screenshots:

#include <iostream> #include <string> using namespace std; class RecordPlayer { 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 public: Recordplayer(); void turnon(); void turnoff(); bool isPoweredon(); void affixPlatter(string r); void plopNeedle(); void returnNeedle(); private: bool ison; string record; pool needleIsOnTheRecord;

Output Screenshots:

clang++-7 -pthread -std=c++17 -o main main.cpp record_player.cpp 3./main Record player is turned on Record Barrow Manila I is now on the platter Needle is placed on the record Needle is returned from the record Record player is turned off Cannot place needle on the record Record player is turned on Cannot place needle on the record Cannot return needle from the record Record player is turned on Cannot return needle from the record Record Barrow Manila I is now on the platter Cannot place needle on the record

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