USB Output Buffers - int to Hexed Chars

Hi all
With regards sending data to a USB device I set up a char like so:
size_t bufferSize = 8;
char *buffer = malloc(bufferSize);
I can then populate my bytes in hex (which seems to be the normal way of doing it).
    buffer[0] = 0xFF;
    buffer[1] = 0xEA;
The two fold question is will I have any issues if i populate the char buffers with integers?
    int value = 256;
    buffer[0] = value;
or does it have to be in hex?
If it requires hex (or even if not cos it would be good to know). What the best way to convert and integer to a hexed char?
Cheers
Steve

It doesn't matter if you specify the value in hexadecimal, decimal, octal or binary (or any other numbering system for that matter).
A number has the same value no matter what base you use.

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