Определить количество домов, построенных раньше заданного года

#include "stdafx.h" 
#include "iostream" 
using namespace std; 
 
struct doma 
{int etazh; 
int god; 
struct doma *next; 
}; 
doma *first, *tek, *last; 
 
void sozd() 
{ last=first=tek=NULL; 
cout«"tochka - konec vvoda "»endl; 
do 
{tek=last; 
last=new doma; 
cout«"vv. kol-vo etazhey - "; 
cin»last->etazh; 
cout«"vv. god postroiki - "; 
cin»last->god; 
last->next=NULL; 
if (first==NULL)first=last; 
else tek->next=last; 
} 
while ((last->etazh)!=0); 
cout«"spisok sozdan"; 
} 
 
void vyvod() 
{tek=first; 
while (tek) 
{cout«tek->etazh«" "«tek->god; 
tek=tek->next; 
}; 
}; 
int kolvo(int zadanny) 
{int k=0; 
tek=first; 
while(tek) 
{if (tek->god<zadanny)k++; 
} 
return k; 
}; 
 
void udalenie() 
{first=tek->next; 
delete tek; 
}; 
 
int _tmain(int argc, _TCHAR* argv[]) 
{int n; 
 
do { 
cout«endl; 
cout«"1. Sozdanie spiska"«endl; 
cout«"2. Vyvod na ekran"«endl; 
cout«"3. Poisk dannyh"«endl; 
cout«"4. Dobavlenie dannyh"«endl; 
cout«"5. Udalenie dannyh"«endl; 
cout«"0. Vyhod"«endl; 
cout«endl; 
cout«endl; 
cout«"Vvedite punkt menu: "; 
cin»n; 
 
switch(n) { 
case 0: break; 
case 1: sozd(); break; 
default: cout «"Neverny"; 
} 
} while (n!=0); 
system ("pause"); 
 
return 0; 
}