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Код: Выделить всё

#include "stdafx.h"
#include <time.h> 
#include "stdio.h"
#include <stdlib.h>
#include <string.h>
#include <malloc.h>

struct list
{
char name [20];
char secondname[20];
list* next;
list* prev;
};
list *clear( list*h )
{
if(!h) return NULL;
list*n;
for(n=h->next;n;n=n->next )
{
if(h) free(h);
h=n;
}
if(h) free (h);
return 0;
}

list* dod(list* first)
{
list* nov;
nov = (list*) malloc(sizeof(list));
if(!nov){
printf("can not allocate memory");
return NULL;
}
printf("vvedid dannue");
scanf("%s,%s",&(nov->name),&(nov->secondname));
nov->next=first;
first=nov;
return first;
}
list* poc( list* head, int num )
{
if (!head)
return NULL;
list*n = head;
for( int i=1; (i<num) && (n->next); i++, n=n->next);
return n;
}
list* per(list*p)
{ list*n=p;
if(p->next)p->next=p->prev;
n->prev=n->next;
return p;
}
list* dob(list*vuz_el)
{
list* n;
n=(list*) malloc(sizeof(list));

if(!vuz_el) return n;

if(vuz_el->next) 
n->next=vuz_el->next;
vuz_el->next=n;
return n;
}
void print(list* first)
{
list*wwe;
wwe=first;
while(wwe)
{
printf("%s,%s\n",wwe->name,wwe->secondname);
wwe=wwe->next;

}


}
void fill_list(list*p)
{
for( ;p;p=p->next)
{
printf(" enter name of student\n");
scanf("%s",&(p->name));

printf("enter secondname of student\n");
scanf("%s",&(p->secondname));

}
}
list *AddL(list *p)
{
list *n = new list;
memset( n, 0, sizeof(list) );
if(!p) return n;

n->next = p->next;
n->prev = p;
p->next = n;

return n;
}


int main ()


{ 
int q; 
printf("vvedit kilkist student\n");
scanf("%d",&q);

list *head, *tail;
head = AddL(NULL);
tail = AddL(AddL( head ));

for(list*p=head;q>1;q--)
p=AddL(p);



for(list*p = head; p; p = p->next)
fill_list(p);

list fx;
list* o=poc( head, 2 );
list* z=dob(&fx);
list* r=dod(&fx);
list* s=per(&fx);


list* p=clear(&fx);
print(head);

int n, i, k,sum=0;
printf("vvedit rozmir masuva\n");
scanf("%d",&n);
int *a=new int [n];
srand(time(NULL));
for (i=0; i<n; i++)
a[i]=rand()%20; //заполнение массива случайными числами от 0 до 19

for (k=0; k<n; k++)
sum+=a[k];
printf("sum=%i",sum); 
delete [] a;
return sum;

}