Accessing Inherited Functions C++


Problem Statement :


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  <= 1000
Note: The new_val only has 2, 3 and 5 as its prime factors.


Solution :



title-img 


                            Solution in C :

class D : public A,public B,public C
{

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


  //Implement this function
  void update_val(int new_val)
  {
    while (new_val!=val) {
      if (new_val/val % 2 == 0) A::func(val);
      else if (new_val/val % 3 == 0) B::func(val);
      else if (new_val/val % 5 == 0) C::func(val);
    }
  }
  //For Checking Purpose
  void check(int); //Do not delete this line.
};








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