Write integer as bytes

file_to_bytes.c

#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>


int main() {
  int n = 1000000;
  int i = 0;


  FILE *f;
  f = fopen("hello.txt", "w");
  while (i<n) {
    fwrite(&i, 1, sizeof(i), f); 
    ++i;
  }
  fclose(f);


  f = fopen("hello.txt", "r");
  char buffer[4];
  while (!feof(f)) {
    fread(buffer, 1, sizeof(buffer), f);
    int x = *(int*) buffer;
    printf("%d\n", x);
  }
  fclose(f);

}