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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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