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Programming > C Moderated > Re: A question ...
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Re: A question about '=='' in C++!

by jk <jimktrains@[EMAIL PROTECTED] > Jan 12, 2008 at 06:24 PM

> i = j ==1;
This tests if the value of j is equal to 1, if so, then i is assigned
1 (true), if not (most likely since you are grabbing random memory),
then it is assigned 0 (false).  j should not be assigned in this
statement.  It may be a fluke that it is 0 (or your compiler init
unassigned vars?)

> i = j = 1;
In this situation, i and j are being assigned the value 1.

Some people prefer to say "gets" with = and "is equal to" with ==, to
distinguish between assignment and equality tests, respectively.

This logic is also valid in C.
#include <stdio.h>
int main(){
    int i, j, k, l;
    i = j == 1;
    k = l = 1;
    printf("i:%d j:%d, k:%d l:%d\n", i, j, k, l);
    return 0;
}
produces:
i:0 j:-1078123064 k:1 l:1

on my computer.

Jim
-- 
comp.lang.c.moderated - moderation address: clcm@[EMAIL PROTECTED]
 -- you must
have an appropriate newsgroups line in your header for your mail to be
seen,
or the newsgroup name in square brackets in the subject line.  Sorry.
 




 25 Posts in Topic:
A question about '=='' in C++!
"Guofu Chen" &l  2007-09-21 05:15:35 
Re: A question about '=='' in C++!
Erik Max Francis <max@  2008-01-12 16:23:47 
Re: A question about '=='' in C++!
Keith Thompson <kst-u@  2008-01-12 16:41:25 
Re: A question about '=='' in C++!
Kenneth Brody <kenbrod  2008-01-12 16:41:51 
Re: A question about '=='' in C++!
Andrei Voropaev <avoro  2008-01-12 16:41:48 
Re: A question about '=='' in C++!
WillerZ <newsreplies@[  2008-01-12 16:41:44 
Re: A question about '=='' in C++!
REH <spamjunk@[EMAIL P  2008-02-17 12:06:12 
Re: A question about '=='' in C++!
"Douglas A. Gwyn&quo  2008-01-12 16:42:24 
Re: A question about '=='' in C++!
Daniel Weber <dw2007@[  2008-01-12 16:42:52 
Re: A question about '=='' in C++!
Barry Schwarz <schwarz  2008-01-12 16:43:19 
Re: A question about '=='' in C++!
kushal_kumaran <kushal  2008-01-12 16:44:17 
Re: A question about '=='' in C++!
Jack Klein <jackklein@  2008-01-12 16:43:35 
Re: A question about '=='' in C++!
Jensen Somers <usenet@  2008-01-12 16:43:45 
Re: A question about '=='' in C++!
VA <buvaira@[EMAIL PRO  2008-01-12 16:44:33 
Re: A question about '=='' in C++!
moschops <moschop@[EMA  2008-01-12 16:45:04 
Re: A question about '=='' in C++!
ta0kira@[EMAIL PROTECTED]  2008-01-12 16:45:39 
Re: A question about '=='' in C++!
Anabelle Collins <nano  2008-01-12 16:45:44 
Re: A question about '=='' in C++!
Joel Yliluoma <bisqwit  2008-01-12 16:46:10 
Re: A question about '=='' in C++!
Barry Schwarz <schwarz  2008-01-12 16:47:47 
Re: A question about '=='' in C++!
jk <jimktrains@[EMAIL   2008-01-12 18:24:26 
Re: A question about '=='' in C++!
hex <iostream64@[EMAIL  2008-01-12 19:01:16 
Re: A question about '=='' in C++!
klausboy2004@[EMAIL PROTE  2008-01-12 19:01:44 
Re: A question about '=='' in C++!
Dave Neary <dneary@[EM  2008-01-12 19:01:50 
Re: A question about '=='' in C++!
Matthias Buelow <mkb@[  2008-01-12 19:03:03 
Re: A question about '=='' in C++!
Sc0rpi0 <sc0rpi0@[EMAI  2008-01-12 19:03:06 

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tan12V112 Sat Jul 26 3:40:38 CDT 2008.