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 |
累乗関数の底を指定する引数に0を入力し、かつ、指数を指定する引数を値を0もしくは負値とした状態で、累乗関数pow()が呼び出されました。
| クラス名 | Undefined Power of Zero | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 日本語クラス名 | Undefined Power of Zero | ||||||||||||||||||||||||
| クラス分類 | 信頼性 (reliability) | ||||||||||||||||||||||||
| ニーモニック | MATH.DOMAIN.POW | ||||||||||||||||||||||||
| カテゴリー |
|
||||||||||||||||||||||||
| 対応言語 | C および C++ で利用可能です。 |
||||||||||||||||||||||||
| 有効/無効設定 | このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル
（configuration file）に以下の WARNING_FILTER ルールを追加してください。
WARNING_FILTER += discard class="Undefined Power of Zero" |
CodeSonar ships with library models that allow it to functions such as libm pow() that compute a power. If one of these functions is called with zero in the "base" parameter position and zero or a negative value in the "power" 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 Undefined Power of Zero warnings.
English (en)
#include <math.h>
double call_pow(double base, double exp){
double a = pow(1,1); /* ok: base and exponent both > 0 */
double b = pow(0,5); /* ok: exponent > 0 */
double c = pow(0,-1); /* 'Undefined Power of Zero' warning issued here */
double d = pow(base,-1); /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
* if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */
double e = pow(0,exp); /* 'Undefined Power of Zero' warning issued here */
double f = pow(base,exp); /* EVIDENCED ONLY: 'Undefined Power of Zero' warning issued here
* if CodeSonar has evidence that call_pow() is called with a value ==0 as the first argument. */
return a+b+c+d+e+f;
}
設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。