Thread: Split/select long hex to pairs

Hi all - its late and I really cannot figure this out!

if unsigned char *s = 42006f, how can I split/select the hex value into its pairs i.e 42/00/6f so that I can manipulate the pair data rather than the large total
using portable ansi c.
thanks!!

I'm not sure to understand what you ask.
Generally you're expected to post some code showing you've done some work, but you're right, it's late.

Code:

#include <stdio.h>
int main(void) {
	size_t v = 0x42006f;
	size_t v1 = v & 0xFF;
	size_t v2 = (v >> 8) & 0xFF;
	fprintf(stderr, "v=%#zx v1=%#zx v2=%#zx\n", v, v1, v2);
	return 0;
}

If this is what you want, you can guess v3, the 3rd byte (0x42).

Looks right in your example - ill give that a shot tomorrow, goodnight! and thanks

hmmm doesn't seem to work I'm afraid. I'll provide some pseudo - probably best!

v = s; /*S being the variable scanned in from user, for example 42006f*/

/*The next bit I don't know how to do, but I know what I want out of it*/

v1 = 42;
v2 = 00;
v3 = 6f

Thanks!

hmmm doesn't seem to work I'm afraid.

root4 gave you the code to split the int into bytes. It's your job to find out how to put them into the order that you think is right.
Just to say it doesn't work is not enough.
Show what you tried and explain why you think it's not right.
Kurt

A "union" is made for this purpose.