Question

Question 2 Implement a C++ class that represents a Third Degree Polynomials equation. Your class must include a default constructor, observers, mutators, equality operators and one helper functions to evaluate the equation. y=ax3+bx2+cx+d

Answer 1

#include <iostream>
using namespace std;

class Polynomial {
private:
    double a, b, c, d;
public:
    Polynomial() {}

    Polynomial(double a, double b, double c, double d) : a(a), b(b), c(c), d(d) {}

    double getA() {
        return a;
    }

    void setA(double a) {
        Polynomial::a = a;
    }

    double getB() {
        return b;
    }

    void setB(double b) {
        Polynomial::b = b;
    }

    double getC() {
        return c;
    }

    void setC(double c) {
        Polynomial::c = c;
    }

    double getD() {
        return d;
    }

    void setD(double d) {
        Polynomial::d = d;
    }

    Polynomial &operator=(const Polynomial &p) {
        a = p.a;
        b = p.b;
        c = p.c;
        d = p.d;
        return *this;
    }

    double evaluate(double x) {
        return a*x*x*x + b*x*x + c*x + d;
    }
};

int main() {
    Polynomial p(2, 3, 4, 5);
    cout << "p(2) = " << p.evaluate(2) << endl;
    return 0;
}