Swap byte 2 and 4 from integer
Posted
by
czar x
on Stack Overflow
See other posts from Stack Overflow
or by czar x
Published on 2013-07-01T17:04:31Z
Indexed on
2013/07/01
17:05 UTC
Read the original article
Hit count: 171
Filed under:
c
I had this interview question - Swap byte 2 and byte4 within an integer sequence. Integer is a 4byte wide i.e. 32 bits
My approach was to use char *pointer and a temp char to swap the bytes.
For clarity i have broken the steps otherwise an character array can be considered.
unsigned char *b2, *b4, tmpc;
int n = 0xABCD;
b2 = &n; b2++;
b4 = &n; b4 +=3;
///swap the values;
tmpc = *b2;
*b2 = *b4;
*b4 = tmpc;
Any other methods?
© Stack Overflow or respective owner
