#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;
}
