Aren't there math and other libraries for c ?

[olddays]

I am using Mandriva 2007

I wrote a simple c program :

 

#include <stdio.h>
#include <math.h>
double d,e,f;
main()
{
double a,b,c;
void hesapla(double x,double y,double z);
scanf("%lf",&a);
scanf("%lf",&b);
scanf("%lf",&c);
hesapla(a,b,c);
}
void hesapla(double x,double y,double z)
{

double delta;
delta=y*y-4*x*z;
if(delta==0)
{ d=-y/2*x;
printf("delta 0 %lf",d);
return;
}
else 
{
if(delta>0)
{
d=(-y-(exp(0.5*log(delta)))/2*x);
e=(-y+(exp(0.5*log(delta)))/2*x);
printf("delta>0 %lf %lf",d,e);
return;
}
else
{
printf("yok bi?i");
return;
}
}
}

 

When I use the cc command I take these errors:

 

denklem.c:(.text+0x10c): undefined reference to `log'

denklem.c:(.text+0x11c): undefined reference to `exp'

denklem.c:(.text+0x13b): undefined reference to `log'

denklem.c:(.text+0x14b): undefined reference to `exp'

collect2: ld returned 1 exit status

 

I thought it was because of the panthomime of math library. Why can it be?

[ilia_kr]

By default GCC plugs in only the stdio.h, you should tell it to plug in other libraries. Try this:

 

gcc -ld  your-code.c -o file.name

 

To learn more about GCC type "man gcc".

Edited December 21, 2006 by ilia_kr

[olddays]

I didn't understrand what you have written as code? What you mean by file.name your-code??

[ilia_kr]

Suppose you have a file with a code you wrote, lets call it "prog.c".

To compile it using GCC, you shuld type in a konsole/terminal emulator the following:

 

gcc -ld [i]/location-of-prog.c[/i] -o [u]name-of-binary[/u]

 

Here how i do it:

 

[ilia@ilia-fc4 ~]$ cd /home/ilia/projects-c

[ilia@ilia-fc4 projects-c]$ ls

a.txt c.txt e.txt HW2.pdf mem.c new out.txt~ tri.c

b.txt d.txt f.txt mem mem.o out.txt tri tri.o

[ilia@ilia-fc4 projects-c]$ gcc -ld mem.c -o mem

[ilia@ilia-fc4 projects-c]$