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Compute the cosine of an angle
#include <math.h>
double cos( double x );
float cosf( float x );
- x
- The angle, in radians, for which you want to compute the cosine.
libm
Use the -l m option to
qcc
to link against this library.
These functions compute the cosine of x
(specified in radians).
|
An argument with a large magnitude may yield results
with little or no significance. |
The cosine of x.
|
If an error occurs, these functions return 0, but this is also a valid
mathematical result.
If you want to check for errors, set
errno
to 0, call the function, and then check errno again.
These functions don't change errno if no errors occurred. |
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
int main( void )
{
double value;
value = cos( M_PI );
printf( "value = %f\n", value );
return EXIT_SUCCESS;
}
produces the output:
value = -1.000000
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
No |
Thread |
Yes |
acos(),
errno,
sin(),
tan()
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