nanog mailing list archives
Re: interger to I P address
From: Dave Israel <davei () otd com>
Date: Wed, 27 Aug 2008 11:22:14 -0400
Normally, I don't participate in this sort of thing, but I'm a sucker for a "there's more than one way to do it" challenge.
Shadow wrote:
Robert D. Scott wrote:The harder way: Decimal: 1089055123 Hex (dashes inserted at octals): 40-E9-A9-93 Decimal (of each octet): 64-233-169-147 IP Address: 64.233.169.147The "this could take all day" way : (in bc with scale=0 for integer portions only) 1089055123/(2^24)%(2^8) 64 1089055123/(2^16)%(2^8) 233 1089055123/(2^8)%(2^8) 169 1089055123/(2^0)%(2^8) 147 (Note: 2^0=1 & x/1=x so last line could reduce to 1089055123%(2^8).) -Nicholas shadow () gti net
The "ugly, please adjust according to your endianness, etc" way: int *dec; unsigned char *oct1, *oct2, *oct3, *oct4; main(int argc, char **argv) { dec = malloc(sizeof(int)); *dec = 1089055123; oct4 = dec; oct3 = oct4 + sizeof(char); oct2 = oct3 + sizeof(char); oct1 = oct2 + sizeof(char);printf("dec: %lu ip: %hu.%hu.%hu.%hu\n", *dec, *oct1, *oct2, *oct3, *oct4);
}
Current thread:
- Re: interger to I P address, (continued)
- Re: interger to I P address Simon Lockhart (Aug 27)
- Re: interger to I P address kcc (Aug 27)
- Re: interger to I P address Colin Alston (Aug 27)
- RE: interger to I P address Matlock, Kenneth L (Aug 27)
- Re: interger to I P address Iljitsch van Beijnum (Aug 27)
- Re: interger to I P address Stephane Bortzmeyer (Aug 27)
- RE: interger to I P address Matlock, Kenneth L (Aug 27)
- RE: interger to I P address Robert D. Scott (Aug 27)
- Re: interger to I P address Colin Alston (Aug 27)
- Re: interger to I P address Shadow (Aug 27)
- Re: interger to I P address Dave Israel (Aug 27)
- Re: interger to I P address Colin Alston (Aug 27)
- Re: interger to I P address Robert Kisteleki (Aug 27)
- Re: interger to I P address Colin Alston (Aug 27)
- Re: interger to I P address Owen DeLong (Aug 27)
- Re: interger to I P address kcc (Aug 27)
- Re: interger to I P address Simon Lockhart (Aug 27)
- Re: interger to I P address Scott Doty (Aug 27)
- Re: interger to I P address David Champion (Aug 27)
- Re: interger to I P address Andree Toonk (Aug 27)
- Re: interger to I P address Brian Epstein (Aug 27)
- Re: interger to I P address Michael Holstein (Aug 27)
- Re: interger to I P address Izaac (Aug 27)