JavaScript is not currently enabled, but is required for full CodeSonar manual search and browse functionality.
If you are viewing this file in your hub's Web GUI, enable JavaScript in your browser: you will also need it for GUI functionality.
If you opened this file directly from disk, your browser may be directly suppressing JavaScript functionality: certain browsers perform this suppression on local files (but not files delivered by web servers) for security reasons.
| CodeSonar® 9.0p0 Hot Tips | CONFIDENTIAL | CodeSecure Inc |
A two-argument arctangent function is passed 0 in the "y" argument position when it may also have been passed 0 in the "x" argument position.
| Class Name | Arctangent Domain Error | ||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | reliability | ||||||||||||||||||||||||||||||
| Mnemonic | MATH.DOMAIN.ATAN | ||||||||||||||||||||||||||||||
| Categories |
|
||||||||||||||||||||||||||||||
| Availability | Available for C and C++. |
||||||||||||||||||||||||||||||
| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Arctangent Domain Error" |
CodeSonar ships with library models that allow it to recognize functions such as libm atan2() that compute a two-argument arctangent. If one of these functions is called with zero in the "y" parameter position and may also have zero in the "x" parameter position, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Arctangent Domain Error warnings.
Japanese (ja)
#include <math.h>
double use_atan2(double ind){
double a = atan2(1,1); /* ok: second (Y) argument is not zero */
double b = atan2(1,0); /* ok: first (X) argument is not zero */
double c = atan2(0,0); /* 'Arctangent Domain Error' warning issued here */
return a+b+c;
}
The following configuration file parameters affect checks for this warning class.