contatore vocali, lettere, numeri (file binari)

/*
Studente : Scia Massimiliano
Classe : 3IC
Data : 13/05/12 18:25
Nome del file : controlla vocali, lettere, numeri
*/

#include <iostream>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cctype>
#include <windows.h>
#include <fstream>
#include <time.h>
#include <stdio.h>
#define N 100

using namespace std;

struct code{
       char c[N];
};//struct

void end(void){
    fflush(stdin);
    cout<<"\n\nPremere Invio per continuare.";
    getchar();
}//end

bool scrivi(char* nomefile){
     FILE* f;
     f=fopen(nomefile,"ab+");
     if(f==NULL)
         return false;
     int n;
     cout<<"\nQuanti codici vuoi inserire?\n- ";
     cin>>n;
     code cd;
     for(int i=0;i<n;i++){
         cout<<"\nCodice "<<i+1<<": ";
         fflush(stdin);
         cin.get(cd.c,N,'\n');
         fflush(stdin);
         fwrite(&cd,sizeof(code),1,f);
     }//for
     fclose(f);
     return true;
}//scrivi

bool controllo(char* nomefile, int a[]){
    FILE* f;
    f=fopen(nomefile,"rb");
    code cd;
    if(f==NULL)
        return false;
    for(int i=0;i<3;i++)
        a[i]=0;
    fread(&cd,sizeof(code),1,f);
    while(!feof(f)){
         for(int j=0;j<strlen(cd.c);j++){
             if(isalpha(cd.c[j])){
                 a[0]++;
                 if(tolower(cd.c[j])=='a' || tolower(cd.c[j])=='e' || tolower(cd.c[j])=='i' || tolower(cd.c[j])=='o' || tolower(cd.c[j])=='u')
                     a[1]++;
             }//if
             if(isdigit(cd.c[j]))
                 a[2]++;
         }//for
         fread(&cd,sizeof(code),1,f);
    }//while
    fclose(f);
    return true;
}//controllo

bool visualizza(char* nomefile, int a[]){
    FILE* f;
    f=fopen(nomefile,"rb");
    if(f==NULL)
        return 0;
    code cd;
    fread(&cd,sizeof(code),1,f);
    while(!feof(f)){
        cout<<"\n\nLettere: "<<a[0]<<"\nVocali: "<<a[1]<<"\nNumeri: "<<a[2];
        fread(&cd,sizeof(code),1,f);
    }//while
    fclose(f);
    return 1;
}//visualize


int main(){
    char nomefile[N];
    int a[N];
    cout<<"\nIl nome del file e`: ";
    fflush(stdin);
    cin.get(nomefile,N,'\n');
    fflush(stdin);
    bool s,c,v;
    s=scrivi(nomefile);
    c=controllo(nomefile,a);
    v=visualizza(nomefile,a);
    end();
    return 0;
}//main