Метод Монте-Карло(непонятная неработоспособность программы)

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
class method{
    public:
        double allsumm(double *x,int n);
        void createrand(double *x,int n);
};
double method::allsumm(double *x,int n){
    double temp=0;
    for(int i=0;i<n;i++){
        temp+=sqrt(pow(x[i],4)-pow(x[i],3)+8);
    }
    return temp;
}
void method::createrand(double *x,int n){
    for(int i=0;i<n;i++){
        x[i]=0.0001*(rand()%30001);
    }
}
void main(){
clrscr();
double a=0,b=3.2,temp;
unsigned long int n;
double *x;
method MonteKarlo;
cout<<"Vvedite koli4estvo to4ek ";
cin>>n;
x=new double[n];
/*cout<<"Vvedite interval\n a: ";
cin>>a;
cout<<"b: ";
cin>>b;*/
MonteKarlo.createrand(x,n);
temp=MonteKarlo.allsumm(x,n);
cout<<"Summ= "<<temp;
cout<<"\nI= "<<((b-a)*temp)/n;
 
getch();
}

#include <iostream.h>
#include <conio.h>
#include <stdlib.h>
#include <math.h>
#include <stdio.h>
class method{
    public:
        double allsumm(double *x,unsigned long int n);
        void createrand(double *x,unsigned long int n);
};
double method::allsumm(double *x,unsigned long int n){
    double temp=0;
    for(unsigned long int i=0;i<n;i++){
        temp+=sqrt(pow(x[i],4)-pow(x[i],3)+8);
    }
    return temp;
}
void method::createrand(double *x,unsigned long int n){
    for(unsigned long int i=0;i<n;i++){
        x[i]=0.0001*(rand()%30001);
    }
}
void main(){
clrscr();
randomize();
double a=0,b=3.2,temp;
unsigned long int n;
double *x;
method MonteKarlo;
cout<<"Vvedite koli4estvo to4ek ";
cin>>n;
x=new double[n];
/*cout<<"Vvedite interval\n a: ";
cin>>a;
cout<<"b: ";
cin>>b;*/
MonteKarlo.createrand(x,n);
temp=MonteKarlo.allsumm(x,n);
cout<<"Summ= "<<temp;
cout<<"\nI= "<<((b-a)*temp)/n;
getch();
}