algoritma (fida dan muthia)
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#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 + 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 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;
}
Cpp
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