База данных бибилиотеки(доработать прогу)

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <iostream.h>
#define MAX 100
struct chit {
 char fio [50];
 char adres [50];
 char telefon [50];
 int godRojd ;
} ;
 
chit vvod(void){
  chit ret;
  cout<<"Vvedite familiy 4itatelya:>";
  cin>>ret.fio;
  cout<<"Vvedite adress 4itatelya:>";
  cin>>ret.adres;
  cout<<"Vvedite telefon 4itatelya:>";
  cin>>ret.telefon;
  cout<<"Vvedite God Rojdeniya 4itatelya:>";
  cin>>ret.godRojd;
  return ret;
  };
 
 
void soxranenie(chit par){
  FILE *F;
  F=fopen("xr.txt","ab");
  if(F==NULL){
    cout<<"ERROR";
    exit(1);
  }
  
  if(fwrite(&par,sizeof(par),1,F)!=1) cout<<"ERROR";
    fclose(F);
  //soxranyaet v fail
};
 
chit chetenie(int par){         //par nomer 4eloveka
  chit ret;
  strcpy(ret.fio,"");
  strcpy(ret.adres,"");
  strcpy(ret.telefon,"");
  ret.godRojd=0;
  FILE *F;
  F=fopen("xr.txt","rb");
  if(F==NULL){
    cout<<"ERROR"<<endl;
    exit(1);
    }
  if(fseek(F,sizeof(struct chit)*par,SEEK_SET)) cout<<"ERROR"<<endl;
  else if(fread(&ret,sizeof(struct chit),1,F)) cout<<"ERROR"<<endl;
  fclose(F);
return ret;
};
 
 
void vivod (chit par){
cout<<"--------------------"<<endl;
cout<<"FIO: "<<par.fio<<endl;
cout<<"Adres: "<<par.adres<<endl;
cout<<"Telefon: "<<par.telefon<<endl;
cout<<"GodRojd: "<<par.godRojd<<endl;
};
 
 
void vivodsp (chit){
    for(int p=0;p<50;p++);
    cout<<p;
}
 
 
 
 
int kolvo(void){
  FILE *F;
  F=fopen("xr.txt","rb");
  if(F==NULL){
    cout<<"ERROR"<<endl;
    exit(1);
    }
  int ret=0;
  chit a;
  while(!feof(F)){
    if(fread(&a,sizeof(struct chit),1,F)) ret++;
   }
 fclose(F);
 return ret+1;
};
 
int strpoisk (char str1[], char str2[]){
    int sch1;
    for(int y=0;y<strlen(str1)-strlen(str2)+1;y++){
       sch1=0;
       for(int x=0;x<strlen(str2);x++)
         if(str1[y+x]==str2[x]) sch1++;
       if(sch1==strlen(str2)) return 1;
    }
    return 0;
};
 
 
void poisk(char fio[]){
  FILE *F;
  F=fopen("xr.txt","rb");
  if(F==NULL){
    cout<<"ERROR"<<endl;
    exit(1);
    }
  chit a;
  while(!feof(F)){
    if(fread(&a,sizeof(struct chit),1,F)){
       if(strpoisk(a.fio,fio)==1) vivod(a);
        }
   }
 fclose(F);
}
 
void poiskfam (void){
char vvodfam[50];
    cout<<"BBEDUTE FAMILIY:>";
    cin>>vvodfam;
    poisk(vvodfam);
}                //pois po famil
void spisokchit (void){
  FILE *F;
  F=fopen("xr.txt","rb");
  if(F==NULL){
    cout<<"ERROR"<<endl;
    exit(1);
    }
  chit a;
  while(!feof(F)){
    if(fread(&a,sizeof(struct chit),1,F)){
       vivod(a);
       }
   }
 fclose(F);
}
 
int main(void){
  
 spisokchit();
 poiskfam();
char ttt;
cin>>ttt;
return 0;
}