Fayllar bilan ishlash. Binar fayllar

3 - misol. n natural soni berilgan. Elementlari n ta butun sondan iborat bo' Igan faylni hosil qiluvchi va juft elementlarini 2 marta orttiruvchi programma tuzilsin.
#include

#include

using namespace std;
int main() {
int n, k;
FILE *f;
// binar faylni yozish va o'qish uchun ochish

f = fopen("binar", "wb+");

if (f == NULL) {
cout « "Faylni hosil qilishda xato bo'ldi";
return 1; }
cout « "n="; cin » n;
for (int i = 0; i < n; i++) {
cin » k;

fwrite(&k, sizeof(k), 1, f) ; }

// fayl ko'rsatkichini fayl boshiga qo'yish

rewind(f);

while (!feof(f)) // fayl oxiri uchramasa bajar

{
fread(&k, sizeof(к), 1, f);

if (k % 2 == 0 ) {
к *= 2;

// fayl ko'rsatkichini sizeof (int) bayt chapga surish

fseek(f, -sizeof(int), SEEK_CUR);
fwrite(&k, sizeof(int), 1, f);
// fayl ko'rsatkichini o'rnatish

fseek(f, ftell(f), SEEK_SET); } }

cout « "fayl elementlariXn";

rewind(f);

while (fread(&k, sizeof(k), 1, f))

cout « к « endl;

fclose(f);

return 0; }

3 - misolni quyidagicha yechish ham mumkin.
#include

#include

using namespace std;
int main () {
int n, k;
FILE *f;
f = fopen("binar", "wb+");

cout « "n="; cin » n;

for (int i = 0; i < n; i++) {
cin » k;
fwrite(&k, sizeof(k), 1, f) ; }
// fayl ko'rsatkichini fayl boshiga qo'yish
rewind(f);
while (!feof(f)) {
// fayl ko'rsatkichi о'mini eslab qolish
int pos = ftell(f);
fread(&k, sizeof(k), 1, f);
if (k % 2 == 0 ) {
к *= 2;
// fayl ko'rsatkichini oldingi xolatiga o'matish

fseek(f, pos, SEEK_SET);

fwrite(&k, sizeof(int), 1, f) ;
// fayl ko'rsatkichi о'mini sizeof (int) ga surish

pos += sizeof(int);

fseek(f, pos, SEEK_SET); }
}
cout « "fayl elementlari\n";

rewind(f);

// fayl elementlarini chiqarish

while (fread(&k, sizeof(k), 1, f))

cout « к « endl;
fclose(f);

return 0; }