Generate a binary file and print all in C

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

int main()
{
  int i;
  FILE *in, *out;
  const int DATA_MAX_LENGTH = 100;
  int  Data[DATA_MAX_LENGTH];
  
  srand(time(NULL));
  
  out = fopen("myfile.bin", "wb");
  if (out == NULL)
  {
    fprintf(stderr, "output file error!\n");
  }
  else
  {
    for (i=0 ; i<DATA_MAX_LENGTH ; ++i)
      Data[i] = rand()%256;
    fwrite(Data, sizeof(Data[0]), DATA_MAX_LENGTH, out);
    fflush(out); /* before you close the output file, please flush it! */
    fclose(out);
  }
    
  /* read */
  in = fopen("myfile.bin","rb");
  if (in == NULL)
  {
    fprintf(stderr, "input file error!\n");
  }
  else
  {
    int filesize, datanum;
    
    fseek(in, 0, SEEK_END);
    filesize = ftell(in);
    fseek(in, 0, SEEK_SET);
    datanum = (filesize)/sizeof(Data[0]);
    printf("File size=%d\n", filesize);
    printf("Number of data=%d\n", datanum);
    if (datanum != DATA_MAX_LENGTH)
    {
      fprintf(stderr, "Number of data not match!\n");
    }
    else
    {
      fread(Data, sizeof(Data[0]), DATA_MAX_LENGTH, in);
      
      /* 
         if your data type is 'char' or 'BYTE', 
         the cout should use 'printf("%d\n", (int)Data[i]);' 
         for output numbers.
      */
      for (i=0 ; i<DATA_MAX_LENGTH ; ++i)
        printf("%d\n", Data[i]);
    }
    
    fclose(in);
  }
    
  system("pause");  /* add this line if your OS is Windows */
  return 0;
}