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cos() command not working in Linux

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# 1  
Old 09-18-2008
cos() command not working in Linux
Hi,
I have written a c program to find cos() of a value , its not working, I am getting value of "val " as 0000.

#include<stdio.h>
#include<math.h>
main()
{
float val;
val = cosf( 1.570796);
printf("\nval = %f",val);
}
# 2  
Old 09-18-2008
How did you compiled your program?
The standard C library math functions are not included in libc; instead, they're in a separate library, libm, which you need to specify explicitly. To compile and link your program the command should be:
Code:
% gcc -o your_prog your_prog.c -lm

Regards
# 3  
Old 09-18-2008
That is not the problem; I compiled here and I get the same result (Ubuntu, GCC 4.2.4). Changing "cosf" to "cos" helped to get it to compile, too. But the result is still wrong. Changing the type of val to double also doesn't help.
# 4  
Old 09-18-2008
This works, and prints -0.009000

Code:
printf("val = %f\n", cos (1.579796));

# 5  
Old 09-18-2008
Correction, now I get the correct result if I change the type to double, or using cosf with float. I guess I looked at the result carelessly the first time. (Making the printf print a newline after and not before helped see what it does, too.) Sorry for any confusion.
Last edited by era; 09-18-2008 at 04:20 AM.. Reason: cosf with float, too
# 6  
Old 09-18-2008
thanks for the reply,
but its not working , I do link with -lm, still not getting correct value which is 0.999624217 but I am getting 0.000796
Smilie
# 7  
Old 09-18-2008
Quote:
Originally Posted by Franklin52
How did you compiled your program?
The standard C library math functions are not included in libc; instead, they're in a separate library, libm, which you need to specify explicitly. To compile and link your program the command should be:
Code:
% gcc -o your_prog your_prog.c -lm

Regards


ya I have done the same, its not working
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