Host introspection
You are encouraged to solve this task according to the task description, using any language you may know.
Print the word size and endianness of the host machine.
Ada
<ada> with Ada.Text_IO; use Ada.Text_IO; with System; use System;
procedure Host_Introspection is begin
Put_Line ("Word size" & Integer'Image (Word_Size));
Put_Line ("Endianness " & Bit_Order'Image (Default_Bit_Order));
end Host_Introspection; </ada> Sample output on a Pentium machine:
Word size 32 Endianness LOW_ORDER_FIRST
C
<c>#include <stdio.h>
- include <stddef.h> /* for size_t */
- include <limits.h> /* for CHAR_BIT */
int main() {
int one = 1;
printf("word size = %d\n", CHAR_BIT * sizeof(size_t)); /* best bet: size_t typically is exactly one word */
if (*(char *)&one) /* if the least significant bit is located in the lowest-address byte */
printf("little endian\n");
else
printf("big endian\n");
return 0;
}</c>
On POSIX-compatible systems, the following also tests the endianness (this makes use of the fact that network order is big endian): <c>
- include <stdio.h>
- include <arpa/inet.h>
int main() {
if (htonl(1) == 1)
printf("big endian\n");
else
printf("little endian\n");
} </c>
Forth
: endian cr 1 cells . ." address units per cell" s" ADDRESS-UNIT-BITS" environment? if cr . ." bits per address unit" then cr 1 here ! here c@ if ." little" else ." big" then ." endian" ;
This relies on c@ being a byte fetch (4 chars = 1 cells). Although it is on most architectures, ANS Forth only guarantees that 1 chars <= 1 cells. Some Forths like OpenFirmware have explicitly sized fetches, like b@.
J
Method A:
":&> (|: 32 64 ;"0 big`little) {"_1~ 2 2 #: 16b_e0 + a. i. 0 { 3!:1 ''
32
little
Method B:
((4*#) ,:&": little`big {::~ '7'={.) {: 3!:3 ] 33 b.~_1
32
little
OCaml
<ocaml>Printf.printf "%d\n" Sys.word_size; (* Print word size *) Printf.printf "%s\n" Sys.os_type; (* Print operating system *)</ocaml> Dunno about endianness
Python
<python>>>> import sys, math >>> int(round(math.log(sys.maxint,2)+1)) 32 >>> sys.byteorder little >>> import socket >>> socket.gethostname() 'PADDY3118-RESTING' >>> </python>