Programming of even the simplest arithmetic operations always leads to errors. And, needless to say, this does also apply to the complex formulas and calculations. Rounding errors are among the most common mathematical errors. After several intermediate calculations are made the result can appear to be as follows: 2 + 2 = -1, even if there were no logical errors in the intermediate stages.
This category also includes the errors resulting from the choice of wrong algorithm. These are incorrect formulas, formulas that do not apply to the processed data, incorrect methods of splitting complex expressions into simpler elements. In the case of algorithm error, the code exactly does what the programmer expected it to do, — he embodied the wrong idea in the code while writing it.
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The Initial And Subsequent Conditions
It happens that when performing some function the program crashes only once – when it calls this function first. The screen can show a distorted image or unexpected information. Perhaps, the calculations will be performed incorrectly, endless cycles will be started or operating system will display a message indicating the app is low on memory. The reason that the program can show such behavior is absence of a file that contains initialization information. After the program is initially run, it creates such a file, and then everything will be all right. It turns out that such an error cannot be made again (more precisely, for the error message repetition it is necessary to install a new copy of the program). But you should not think that the error occurring only during the first run of the program is insignificant: in fact, it will be the first thing each new user will face.
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Sometimes, while coding the process associated with successive conversion of information, the developers forget that the users may need to go back to the original data and change them. How will the program behave in such a situation? Will it be allowed to make the necessary changes and will it result in a waste of time the user spends to do this work? What will the user have after returning the program to its initial state: will the program use its own data or default values to initialize variables at startup?
Services of security testing companies are worth considering because they help to prevent and eliminate sensitive data leakage. They can identify flaws in the defense mechanisms of an information system that protects confidential data and maintains functionality as expected.