delorie.com/archives/browse.cgi | search |
Message-ID: | <3E2726AB.9030704@earthlink.net> |
From: | Martin Ambuhl <mambuhl AT earthlink DOT net> |
User-Agent: | Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 |
X-Accept-Language: | en-us, en, de, fr, ru, el, zh |
MIME-Version: | 1.0 |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: sizeof(struct x) doesn't compile -- how to do it ? |
References: | <b07318$3eg$1 AT news DOT online DOT de> |
Lines: | 49 |
Date: | Thu, 16 Jan 2003 21:40:16 GMT |
NNTP-Posting-Host: | 67.210.12.88 |
X-Complaints-To: | abuse AT earthlink DOT net |
X-Trace: | newsread2.prod.itd.earthlink.net 1042753216 67.210.12.88 (Thu, 16 Jan 2003 13:40:16 PST) |
NNTP-Posting-Date: | Thu, 16 Jan 2003 13:40:16 PST |
Organization: | EarthLink Inc. -- http://www.EarthLink.net |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Reply-To: | djgpp AT delorie DOT com |
Lars Hansen wrote: > #include "stdlib.h" > > struct x > { > double x; > }; > > int main() > { > x* n=malloc(2*sizeof(struct x)); > } > > > produces the following compiler error message: > > test.c: In function `main': > test.c:10: `x' undeclared (first use in this function) > test.c:10: (Each undeclared identifier is reported only once > test.c:10: for each function it appears in.) > test.c:10: `n' undeclared (first use in this function) > > > So how do I get the size of structs with djgpp? #include <stdlib.h> struct x { double x; }; int main() { struct x *n = malloc(2 * sizeof(struct x)); } > > And also: if i have an array of a struct with several elements how can i know > at which byte an element of the nth struct is in that array with djgpp (eg > after writing a struct array to file and then loading this data without > knowing how to "synchronize" djgpps compiler struct array generation and > saving and an other compilers array struct generation and loading means one > best knows the byte position (and length)) Lookup offsetof()
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |