Question

i am trying to write content of a very large char array to the hard disk.
I have the following array(actually the size of it is going to be very large)
I am using the array as a bit array and after inserting a specified number of bits into it I have to copy its content to another array and write this copy into hard disk. I then empty the content of the array by assigning it 0 for further use.

unsigned char       bit_table_[ROWS][COLUMNS];

Answer 1

You should open a file for writing, and then write the array to it:

FILE * f;
f = fopen(filepath, "wb"); // wb -write binary
if (f != NULL) 
{
    fwrite(my_arr, sizeof(my_arr), 1, f);
    fclose(f);
}
else
{
    //failed to create the file
}

References: fopen, fwrite, fclose