Accessing Inherited Functions in C++ – Hacker Rank Solution | HackerRank Programming Solutions | HackerRank C++ Solutions

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Introduction To C++

C++ is a general-purpose programming language that was developed as an enhancement of the C language to include object-oriented paradigm. It is an imperative and a compiled language. 

C++ is a middle-level language rendering it the advantage of programming low-level (drivers, kernels) and even higher-level applications (games, GUI, desktop apps etc.). The basic syntax and code structure of both C and C++ are the same. 

C++ programming language was developed in 1980 by Bjarne Stroustrup at bell laboratories of AT&T (American Telephone & Telegraph), located in U.S.A. Bjarne Stroustrup is known as the founder of C++ language.

Accessing Inherited Functions in C++  - Hackerrank Solution

Problem

You are given three classes A, B and C. All three classes implement their own version of func.

In class A, func multiplies the value passed as a parameter by 2 :

class A
{
    public:
        A(){
            callA = 0;
        }
    private:
        int callA;
        void inc(){
            callA++;
        }

    protected:
        void func(int & a)
        {
            a = a * 2;
            inc();
        }
    public:
        int getA(){
            return callA;
        }
};

in class B, func multiplies the value passed as a parameter by 3 :

class B
{
    public:
        B(){
            callB = 0;
        }
    private:
        int callB;
        void inc(){
            callB++;
        }
    protected:
        void func(int & a)
        {
            a = a * 3;
            inc();
        }
    public:
        int getB(){
            return callB;
        }
};

In class C, func multiplies the value passed as a parameter by 5 :

class C
{
    public:
        C(){
            callC = 0;
        }
    private:
        int callC;
        void inc(){
            callC++;
        }
    protected:
        void func(int & a)
        {
            a = a * 5;
            inc();
        }
    public:
        int getC(){
            return callC;
        }
};

You are given a class D:

class D 
{

	int val;
	public:
		//Initially val is 1
		 D()
		 {
		 	val = 1;
		 }


		 //Implement this function
		 void update_val(int new_val)
		 {

			
		 }
		 //For Checking Purpose
		 void check(int); //Do not delete this line.
};

You need to modify the class D and implement the function update_val which sets D’s val to new_val by manipulating the value by only calling the func defined in classes A, B and C.
It is guaranteed that new_val has only 2, 3 and 5 as its prime factors.


Input Format :

Implement class D’s function update_val. This function should update D’s val only by calling A, B and C’s func.

Constraints :

1<= new_val <= 10000
Note: The new_val only has 2, 3 and 5 as its prime factors.


Sample Output :

A’s func will be called once.
B’s func will be called once.
C’s func will be called once.

Explanation :

Initially, val = 1.
A’s func is called once:

val = val*2  
val = 2

B’s func is called once:

val = val*3
val = 6

C’s func is called once:

val = val*5
val = 30
Accessing Inherited Functions in C++ – Hacker Rank Solution
#include<iostream>

using namespace std;

class A
{
    public:
        A()
        {
            callA = 0;
        }
    private:
        int callA;
        void inc()
        {
            callA++;
        }

    protected:
        void func(int & a)
        {
            a = a * 2;
            inc();
        }
    public:
        int getA()
        {
            return callA;
        }
};

class B
{
    public:
        B()
        {
            callB = 0;
        }
    private:
        int callB;
        void inc()
        {
            callB++;
        }
    protected:
        void func(int & a)
        {
            a = a * 3;
            inc();
        }
    public:
        int getB(){
            return callB;
        }
};

class C
{
    public:
        C()
        {
            callC = 0;
        }
    private:
        int callC;
        void inc()
        {
            callC++;
        }
    protected:
        void func(int & a)
        {
            a = a * 5;
            inc();
        }
    public:
        int getC()
        {
            return callC;
        }
};

/* Accessing Inherited Functions in C++ - Hacker Rank Solution START */
class D : public A,B,C
{

	int val;
	public:
	//Initially val is 1
	D()
	{
	    val = 1;
	}
	//Implement this function
	void update_val(int new_val)
	{
             int a = new_val;
             while(new_val!=0)
             {
                 if(val==a)
                    break;
                 if(new_val%2==0)
                 {
                     A::func(val);
                     new_val/=2;
                 }
                 else if(new_val%3==0)
                 {
                     B::func(val);
                     new_val/=3;
                 }
                 else if(new_val%5==0)
                 {
                     C::func(val);
                     new_val/=5;
                 }
             }
			
	}
	//For Checking Purpose
	void check(int); //Do not delete this line.
};
/* Accessing Inherited Functions in C++ - Hacker Rank Solution END */

void D::check(int new_val)
{
    update_val(new_val);
    cout << "Value = " << val << endl << "A's func called " << getA() << " times " << endl << "B's func called " << getB() << " times" << endl << "C's func called " << getC() << " times" << endl;
}

int main()
{
    D d;
    int new_val;
    cin >> new_val;
    d.check(new_val);

}

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