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Howdy!<br>
<br>
Evo začetek man strani od round na moji mašini:<br>
<br>
<font color="#990000">NAME<br>
round, roundf, roundl - round to nearest integer, away from zero<br>
<br>
SYNOPSIS<br>
#include <math.h><br>
<br>
double round(double x);<br>
float roundf(float x);<br>
long double roundl(long double x);<br>
<br>
Compile with -std=c99; link with -lm.</font><br>
<br>
Zlasti zadnja vrstica je pomenljiva:<br>
<br>
<font color="#000099">$ gcc -Wall -o test test.c<br>
test.c: In function ‘main’:<br>
test.c:6: warning: implicit declaration of function ‘round’<br>
test.c:6: warning: incompatible implicit declaration of built-in
function ‘round’</font><br>
<br>
med tem ko pri<br>
<br>
<font color="#000099">$ gcc -Wall -std=c99 -o test test.c</font><br>
<br>
ne javi ničesar ...<br>
<br>
$ gcc --version<br>
gcc (GCC) 4.1.2 20060901 (prerelease) (Debian 4.1.1-13)<br>
Copyright (C) 2006 Free Software Foundation, Inc.<br>
This is free software; see the source for copying conditions. There is
NO<br>
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.<br>
<br>
<pre>Peace!
Mkx
-- perl -e 'print $i=pack(c5,(41*2),sqrt(7056),(unpack(c,H)-2),oct(115),10);'
-- echo 16i[q]sa[ln0=aln100%Pln100/snlbx]sbA0D4D465452snlb xq | dc
</pre>
<hr>
<pre>It were not best that we should all think alike; it is difference of opinion
that makes horse-races.
-- Mark Twain, "Pudd'nhead Wilson's Calendar"</pre>
<br>
<br>
Miha Tomšič wrote:
<blockquote
cite="midd790bfa50612041127t5494998bn8e1df5e15a85360d@mail.gmail.com"
type="cite">Hojla!
<br>
<br>
Imam en problem in kup težav.
<br>
<br>
Vzemimo test.c:
<br>
----------------
<br>
#include <math.h>
<br>
#include <stdio.h>
<br>
<br>
int main(void)
<br>
{
<br>
printf("%f, %f\n", 5.6, round(5.6));
<br>
return 0;
<br>
}
<br>
-----------------
<br>
<br>
[pingo@localhost ~]$ gcc test.c -o test
<br>
test.c: In function 'main':
<br>
test.c:6: warning: incompatible implicit declaration of built-in
<br>
function 'round'
<br>
[pingo@localhost ~]$ ./test
<br>
5.600000, 6.000000
<br>
<br>
Vse lepo in prav, če zanemarimo zgornje opozorilo. -lm ni potreben,
<br>
ker uporabi kar vgrajeno funkcijo round().
<br>
<br>
[pingo@localhost ~]$ gcc test.c -o test -fno-builtin -lm
<br>
[pingo@localhost ~]$ ./test
<br>
5.600000, 76941697922011962845100419780797605609472.000000
<br>
<br>
[pingo@localhost ~]$ gcc --version
<br>
gcc (GCC) 4.1.1 20061011 (Red Hat 4.1.1-30)
<br>
<br>
---------------------
<br>
<br>
Saj mogoče sem jaz malo usekan, ampak zadeva je podobno bizarna tudi
<br>
na drugi mašini:
<br>
# gcc test.c -o test -lm
<br>
# ./test
<br>
5.600000, -0.000000
<br>
# gcc --version
<br>
2.95.4
<br>
<br>
A kdo vidi kje kakšno očitno napako? Problem se pojavlja še pri drugih
<br>
matematičnih funkcijah (recimo sqrt()).
<br>
<br>
Hvala in srečno, Miha
<br>
<pre wrap="">
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</pre>
</blockquote>
<br>
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