Algoritma Pencarian Acak

#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 = hasil;
            maksY = 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 dari x: " <<endl;
    cin >> awal >> akhir;
    
    int iterasi;
    cout <<"Masukkan 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;
}