fwrite function in C

Question

fwrite function is used for writing in binary.

fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);

here size in "size_t size" represent byte i.e. fwrite() writes nmemb elements of data, each "size" bytes long.

"size" can be 1 byte or can be more. So for int which is of 2 bytes, if we gave 'size' 1 byte, how that integer is written? May be written integer is wrong? Or we should take care of it while writing integer and set value of size equal to 2?

Answer 1

When you write an int array using fwrite, you will need to use:

size_t num = fwrite(array, sizeof(int), arraySize, file);
if ( num != arraySize )
{
    // Deal with the error condition.
}