math.h
Jessel Savory
plug-devel@lists.PLUG.phoenix.az.us
Sun May 18 21:42:02 2003
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Are you compiling with a -lm to include the math library?
----- Original Message -----=20
From: Phil Winninghoff=20
To: Developers PLUG=20
Sent: Sunday, May 18, 2003 5:12 PM
Subject: math.h
I just started a project using GNU gcc that requires some rotation of =
graphics. The following snippet will not compile using either Debian 2.2 =
or Red Hat 9:
#include <stdio.h>
#include <math.h>
int main() {
float x, y, xp, yp, a;
x =3D 100.0; y =3D 70.0; a=3D0.95;
xp =3D (x*cos(a)) - (y*sin(a));
yp =3D (x*sin(a)) + (y*cos(a));
printf("xp =3D %f\nyp =3D %f\n", xp, yp);
return 0;
}
It compiles using Borland Turbo C++ under MD-DOS.=20
The gcc GNU compiler tells me it can not find either the sin() or =
cos() functions.
Can anyone give me some help?
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<DIV><FONT face=3DArial size=3D2>Are you compiling with a -lm to include =
the math=20
library?</FONT></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dpegaphil@cox.net href=3D"mailto:pegaphil@cox.net">Phil =
Winninghoff</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
title=3Dplug-devel@lists.PLUG.phoenix.az.us=20
href=3D"mailto:plug-devel@lists.PLUG.phoenix.az.us">Developers =
PLUG</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, May 18, 2003 5:12 =
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> math.h</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>I just started a project using GNU =
gcc that=20
requires some rotation of graphics. The following snippet</FONT><FONT=20
face=3DArial size=3D2> will not compile using either Debian 2.2 =
or Red Hat=20
9:</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>#include <stdio.h></FONT></DIV>
<DIV><FONT face=3DArial size=3D2>#include <math.h></FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>int main() {</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> float x, y, xp, yp, =
a;<BR> x =3D=20
100.0; y =3D 70.0; a=3D0.95;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> xp =3D (x*cos(a)) - =
(y*sin(a));</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> yp =3D (x*sin(a)) + =
(y*cos(a));<BR> =20
printf("xp =3D %f\nyp =3D %f\n", xp, yp);</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> return 0;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>}</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>It compiles using Borland Turbo C++ =
under MD-DOS.=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The gcc GNU compiler tells me it can =
not find=20
either the sin() or cos() functions.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Can anyone give me some =
help?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial =
size=3D2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>
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