Composition Help - Fast Engine

Question

You are creating a program to make Cars. Each Car has an Engine, which is declared as a separate class.
Complete the given code to:
1. call the start() method of the Engine in the start() method of the Car,
2. create a Car object with the given Engine and inputs in main and call its start() method.

My code (below) is incorrect, i call the engine start() function in main, which is not what the question wanted. All the various ways i tried to call the engine start() function in the start() method in Car class gave me errors.

Answer 1

#include <iostream>
using namespace std;

class Engine {
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<<power<<" horsepower)";
}
private:
int power;
};
class Car {
public:
Car(Engine x, string c, int y): e(x), color(c), year(y) {};
void start() {
cout <<"Starting"<<endl;
//your code goes here

}
private:
Engine e;
string color;
int year;
};

int main() {
int power;
string color;
int year;
cin >> power >> color >> year;

Engine e(power);
//your code goes here
Car carObject(power, color, year);
carObject.start();
Engine engObject(power);
engObject.start();

}

Answer 2

#include <iostream>
using namespace std;

class Engine {
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<<power<<" horsepower)";
}
private:
int power;
};
class Car {
public:
Car(Engine x, string c, int y): e(x), color(c), year(y) {};
void start() {
cout <<"Starting"<<endl;
//your code goes here

e.start();

}
private:
Engine e;
string color;
int year;
};

int main() {
int power;
string color;
int year;
cin >> power >> color >> year;

Engine e(power);
//your code goes here

Car car(power, color, year);
car.start();

}

Answer 3

Just call e.start() inside Car::start, you are supposed to use the private `Engine` instance <e>.

And remove these

Engine e(power);
Engine engObject(power);
engObject.start();

from main function.

Answer 4

// TITLE: composition.cpp
#include<bits/stdc++.h>
#include <iostream>
using namespace std;
typedef long long ll;
typedef long double ld;
/*ENGINE CLASS*/
class Engine {
private:
int power;
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<<power<<" horsepower)";
}
};
/*CAR CLASS*/
class Car {
private:
Engine eng;
string color;
int year;
public:
Car(Engine x, string c, int y): eng(x), color(c), year(y) {};
void start() {
cout <<"Starting"<<endl;
//your code goes here
//eng.start();

}
};
/*SOLVE FUNCTION*/
void solve(){
std::vector<char> v;
}
/*main.cpp*/
int main()
{
ios::sync_with_stdio(0);

int power;
string color;
int year;
cin >> power >> color >> year;

Engine e(power);
//your code goes here
Car c1(power,color,year);
c1.start();
Engine eng(power);
eng.start();
return 0;
}
/*
Input

142
black
2017

Expected Output

Starting
Engine ON (142 horsepower)

*/

Answer 5

Привет, Денис! Взял твой код за основу, пятый пункт не проходит, не подскажешь какое условие в пятом пункте теста.

Answer 6

#include <iostream>
using namespace std;

class Engine {
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<<power<<" horsepower)";
}
private:
int power;
};
class Car {
public:
Car(Engine x, string c, int y): e(x), color(c), year(y) {};
void start() {
cout <<"Starting"<<endl;
//your code goes here

}
private:
Engine e;
string color;
int year;
};

int main() {
int power;
string color;
int year;
cin >> power >> color >> year;

Engine e(power);
//your code goes here
Car carObject(power, color, year);
carObject.start();
Engine engObject(power);
engObject.start();

}

Good Luck

Answer 7

Thank you very much, I really got stuck with it) 🙏

Answer 8

#include <iostream>
using namespace std;

class Engine {
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<<power<<" horsepower)";
}
private:
int power;
};
class Car {
public:
Car(Engine x, string c, int y): e(x), color(c), year(y) {};
void start() {
cout <<"Starting"<<endl;
//your code goes here
e.start();
}
private:
Engine e;
string color;
int year;
};

int main() {
int power;
string color;
int year;
cin >> power >> color >> year;

Engine e(power);
//your code goes here
Car car(e,color,year);
car.start();
Engine eng(power);

}

Answer 9

#include <iostream>
using namespace std;

class Engine {
public:
Engine(int p): power(p) {};
void start() {
cout <<"Engine ON ("<> power >> color >> year;

Engine e(power);
//your code goes here
Car car(e,color,year);
car.start();
Engine eng(power);

}

Answer 10

Composition Help - Fast Engine
You are creating a program to make Cars. Each Car has an Engine, which is declared as a separate class.
Complete the given code to:
1. call the start() method of the Engine in the start() method of the Car,
2. create a Car object with the given Engine and inputs in main and call its start() method.

how to solve this problem please tell me