strukLab1Z3

// Polinom.h
#pragma once
#include <iostream>
using namespace std;

class Polinom {
    double *a;
    int s;
public:
    Polinom();
    Polinom(int s);
    ~Polinom();
    Polinom(const Polinom &x);
    void postaviK(int *s, double *niz, int n);
    void stampaj();
    friend Polinom mul(Polinom &a, Polinom &b);
    void operator=(const Polinom& x);
};

//Polinom.cpp
#include "Polinom.h"

Polinom::Polinom(int s) {
    this->s = s;
    a = new double[this->s + 1]();
}

Polinom::Polinom() : Polinom(2) {}

Polinom::~Polinom() {
    if (a) {
        delete[] a;
    }
}

Polinom::Polinom(const Polinom &x) {
    s = x.s;
    a = new double[s + 1]();
    for (int i = 0; i <= s; i++)
        this->a[i] = x.a[i];
}

void Polinom::postaviK(int *s, double *niz, int n) {
    for (int i = 0; i < n; i++) {
        if (s[i] <= this->s && s[i] >= 0)
            a[s[i]] = niz[i];
    }
}

void Polinom::stampaj() {
    cout.precision(10);
    for (int i = s; i > 0; i--) {
        if (a[i] != 0)
            cout << " " << showpos << a[i] << " * x^" << noshowpos << i;
    }
    if (a[0] != 0)
        cout << " " << showpos << a[0];
    cout << endl;
}

Polinom mul(Polinom &a, Polinom &b) {
    Polinom x(a.s + b.s);
    for (int i = 0; i < a.s + 1; i++) {
        for (int j = 0; j < b.s + 1; j++) {
            x.a[i + j] = a.a[i] * b.a[j] + x.a[i + j];
        }
    }
    return x;
}

void Polinom::operator=(const Polinom &x) {
    if (a) {
        delete[] this->a;
    }
    s = x.s;
    a = new double[s + 1]();
    for (int i = 0; i <= s; i++)
        this->a[i] = x.a[i];
}

//main
void main() {
    Polinom x(4);
    int exp[3], e = 3;
    double niz[3];
    for (int i = 0; i < 3; i++) {
        cin >> exp[i] >> niz[i];
    }
    x.postaviK(exp, niz, e);
    x.stampaj();
    Polinom g;
    g = x;
    Polinom z;
    z = mul(x, g);
    z.stampaj();
}