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Message: [QUOTE="Charles Mills, post: 2456708"] [b] Here is another non protable (but interesting) version based on code from the book Hackers Delight: #if CHAR_BIT != 8 # error ---> Code below only works on platforms with CHAR_BIT == 8 #endif static unsigned char reverse_byte(unsigned char x) { x = (x & 0x55) << 1 | (x >> 1) & 0x55; x = (x & 0x33) << 2 | (x >> 2) & 0x33; x = (x & 0x0F) << 4 | (x >> 4) & 0x0F; return x; } Nice divide and conquer approach 0x55 => 01010101 0x33 => 00110011 0x0F => 00001111 -Charlie[/b] [/QUOTE]