104 lines
2.0 KiB
C++
104 lines
2.0 KiB
C++
#include <iostream>
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#include <fstream>
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#include <vector>
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using namespace std;
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class Wielomian
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{
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public:
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void readFromFile(string filename)
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{
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string str;
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stopien = 0;
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fstream file(filename);
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if (!file)
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{
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cerr << "Nie udalo sie otworzyc pliku o nazwie: " << filename << "\n";
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exit(EXIT_FAILURE);
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}
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while (getline(file, str))
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{
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a.insert(a.begin(), stof(str));
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stopien++;
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}
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file.close();
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}
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void setX(float x)
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{
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this->x = x;
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}
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int getStopien() {
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return this->stopien;
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}
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void oblicz()
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{
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b.resize(stopien);
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for (int i = stopien - 1; i >= 0; i--)
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{
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if (i == stopien)
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{
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b[i] = a[i];
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}
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else if (i > 0)
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{
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b[i] = a[i] + b[i + 1] * x;
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}
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else if (i == 0)
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{
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b[i] = a[i] + b[i + 1] * x;
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}
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}
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}
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float oblicz_rekurencyjnie(int n) {
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if (n == 0) {
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return a[0];
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}
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return a[n] + x * oblicz_rekurencyjnie(n - 1);
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}
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void wyswietl_wynik()
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{
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for (int i = b.size() - 1; i >= 0; i--)
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{
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cout << "b" << i << ": " << b[i] << "\n";
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}
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cout << "Rozwiazaniem wielomianu jest: " << b[0] << endl;
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}
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void reverse_a() {
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reverse(a.begin(), a.end());
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}
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private:
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vector<float> a;
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vector<float> b;
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int stopien;
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float x;
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};
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int main()
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{
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float x = 0;
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Wielomian wielomian;
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cout << "Program do obliczenia wielomianu schematem hornera\n";
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cout << "Podaj x dla ktorego szukamy rozwiazania: ";
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cin >> x;
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wielomian.readFromFile("dane.txt");
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wielomian.setX(x);
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wielomian.oblicz();
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wielomian.wyswietl_wynik();
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wielomian.reverse_a();
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cout << "\nWynik rekurencyjny: " << wielomian.oblicz_rekurencyjnie(wielomian.getStopien() - 1) << endl;
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return 0;
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} |