Trigonometry missing? Post: 302540963

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Top Forums Programming Trigonometry missing? Post 302540963 by Pelle-48 on Friday 22nd of July 2011 05:02:36 AM

07-22-2011

Registered User

Simple code

Quote:

Originally Posted by pludi

What do you mean by "different"? Can you give a short example program? Can you tell what you're expecting and what you're getting?

OK this is a simple code:

Code:

#include<stdio.h>
#include<math.h>

void main ()
{
int a;
float b,c,d,e;

a=628;
b=a/600;
c=sin(b);
d=cos(b);
e=tan(b);

printf("\n%d",a);
printf("\n%f",b);
printf("\n%f",c);
printf("\n%f",d);
printf("\n%f",e);

}

Test this in Linux, please!

---------- Post updated at 04:02 AM ---------- Previous update was at 03:54 AM ----------

Quote:

Originally Posted by pflynn

Not sure of what you mean, but most of the questions related to the use of the GNU Libc mathematical funcions have to do with linking time problems. To compile and link programs that use the functions from the mathematical library, you need to explicitly tell gcc (or g++) to link your program agaist the library:

Code:

gcc -o mathdemo mathdemo.c -lm

OK I will see if I have any mathematic lib in my Fedora. Could the reason be that math.h in Linux should work for all kind of CPU (not only x86) so you need a sep lib for every CPU.

Last edited by Franklin52; 07-22-2011 at 07:07 AM.. Reason: Please use code tags for code and data samples, thank you

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sincosl

SINCOS(3)						     Linux Programmer's Manual							 SINCOS(3)

NAME

       sincos, sincosf, sincosl - calculate sin and cos simultaneously

SYNOPSIS

       #define _GNU_SOURCE
       #include <math.h>

       void sincos(double x, double *sin, double *cos);
       void sincosf(float x, float *sin, float *cos);
       void sincosl(long double x, long double *sin, long double *cos);

       Link with -lm.

DESCRIPTION

       Several	applications  need  sine  and cosine of the same angle x.  This function computes both at the same time, and stores the results in
       *sin and *cos.

       If x is a NaN, a NaN is returned in *sin and *cos.

       If x is positive infinity or negative infinity, a domain error occurs, and a NaN is returned in *sin and *cos.

RETURN VALUE

       These functions return void.

ERRORS

       See math_error(7) for information on how to determine whether an error has occurred when calling these functions.

       The following errors can occur:

       Domain error: x is an infinity
	      An invalid floating-point exception (FE_INVALID) is raised.

       These functions do not set errno.

VERSIONS

       These functions first appeared in glibc in version 2.1.

CONFORMING TO

       This function is a GNU extension.

SEE ALSO

       cos(3), sin(3), tan(3), feature_test_macros(7)

COLOPHON

       This page is part of release 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2008-08-11								 SINCOS(3)