Accessing Inherited Functions in C++ | HackerRank Solution

Hello coders, today we are going to solve Accessing Inherited Functions HackerRank Solution in C++.

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 Input

new_val = 30

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

Solution – Accessing Inherited Functions in C++

C++

#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;
        }
};

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.
};



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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