Односвязный список(помогите немного исправить)

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <iostream>
#include <cstdlib>
#define N 10
using namespace std;
 
struct list
{
int number;
list *next;
list (int n=0, list*p=NULL)
{number=n;
next=p;
}
};
list *Add_host(list*head, int num)
{
list *q=new list(num),*t=head;
if (head==NULL)return q;
while (t->next!=NULL)t=t->next;
t->next=q;
return head;
}
list *Build()
{
char str[N];
list *head=NULL;
cout<<"\n sozdaem spisok(enter-konec)\n";
while (1)
{
gets(str);
if (str[0]=='\0') break;
head=Add_host(head, atoi(str));
}
return head;
}
void Print (list *head)
{
cout<<"\n poluchenni spisok\n";
while (head!=NULL)
{
cout<<head->number<<"->";
head=head->next;
}
}
 
list * Delete_value(list *first, int val)
{
list *t=first;
if(first==NULL)
{puts("No value");
return NULL;
}
if(first ->number<=val)
{
    first=first->next;
    delete t;
    cout<<first->next;
    return first;
}
while(t->next !=NULL)
    if(t->next->number<=val)
        {
            tmp=t->next;
            t->next=t->next->next;
            delete *tmp;
            cout<<t->next;
            return first;
    }
    else t=t->next;
    puts("no value");
    return first;
}
void main()
{
list*head;
int a,val;
cout<<"programma ydalayet elementi spiska men'she zadannogo\n";
head=Build();
Print(head);
cout<<"\n vvedite element  spiska: ";
cin>>val;
Delete_value(head, val);
if (val!=0)
{
cout<<"element naiden";
Print(head);
}
system("pause");
 
}