пожалуйста сделайте

#include <iostream>
 
using namespace std;
 
struct confectum
{
int stoimost;
unsigned char* srok;
int nomer;
 
confectum(int a, unsigned char* b, int c){stoimost=a;srok= b;nomer=c;}
};
 
struct list
{
confectum* p;
list* next;
list* prev;
 
list(){ p = 0; next=0; prev=0;};
list(int a, unsigned char* b, int c){p = 0; next=0; prev=0; p = new confectum(a,b,c);}
list(int a, unsigned char* b, int c, list* d){p = 0; next=0; prev=d; p = new confectum(a,b,c);}
void add_next(int a, unsigned char* b, int c){next = new list(a,b,c,this);}
 
};
 
list* r;
list* pr;
 
int main()
{
 
}
r = new list(34, (unsigned char*)"adfg1", 5);
pr = r;
 
pr->add_next(14, (unsigned char*)"adfg2", 4);
pr = pr->next;
 
pr->add_next(17, (unsigned char*)"adfg3", 3);
pr = pr->next;
 
pr->add_next(59, (unsigned char*)"adfg4", 2);
pr = pr->next;
 
pr->add_next(78, (unsigned char*)"adfg5", 1);
pr = pr->next;
 
pr = r;
while(pr)
{
if  (pr->p->stoimost > 30 &&  pr->p->stoimost<55)
cout << "stoimost: "<< pr->p->stoimost
     << "\nsrok:" <<  pr->p->srok
     << "\nnomer:" << pr->p->nomer << "\n";
pr = pr->next;
}
 
 
return 0;
}