#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
double fungPoli(double a, double b, double c, double d, double X) {
return a * X * X * X + b * X * X + c * X + d;
}
double penAcak(double a, double b, double c, double d, double awal, double akhir, int iterasi) {
srand(time(0));
double maksY = fungPoli(a, b, c, d, awal);
double maksX = awal;
for (int i = 1; i <= iterasi; i++) {
double x = awal + ((double)rand() / RAND_MAX) * (akhir - awal);
double hasil = fungPoli(a, b, c, d, x);
if (hasil > maksY) {
maksY = hasil;
maksX = x;
}
}
return maksX;
}
int main() {
double a, b, c, d;
cout << "masukkan koefisien a, b, c, dan d: " << endl;
cin >> a >> b >> c >> d;
double awal, akhir;
cout << "masukkan nilai awal dan akhir x: " << endl;
cin >> awal >>akhir;
int iterasi;
cout << "masukan jumlah iterasi: ";
cin >> iterasi;
double maksX = penAcak(a, b, c, d, awal, akhir, iterasi);
double maksY = fungPoli(a, b, c, d, maksX);
cout << "nilai x untuk fungsi maksimum/minimum = " << maksX << endl;
cout << "nilai fungsi kuadrat pada x = " << maksX << "adalah" << maksY << endl;
system("PAUSE");
return 0;
}
