debugging - How to debug a program without a debugger? -

-

Interview question -

Once you have trouble with your code, debug the program It is quite easy. You can keep clocks, breakpoints and so on. Life is very easy due to debugger.

But how to debug a program without a debugger?

A potential approach that I know, you are putting print statements wherever you want to check the problems in your code.

Is there any other way other than this?

As a general question, it is not limited to any specific language. So please share your thoughts so that you do it?

Edit - When submitting your answer, please refer to useful resources about any concept (if you have one) such as logging
it is very helpful for those people Who will not know about it at all. (It contains me in some cases :)

Update: Michal Zanjaner created a real "best" answer and also a community wiki. In fact, lots of votes are entitled.

Actually you have a lot of possibilities, either with the recombination of the source code Or without

With re-organization.

  • Extra. Use either of the following steps in either program logs or system logging (eg output debugstring or event logon windows):
    • Always include timestamps at least seconds long resolution.
    • Consider adding thread-ids in the case of multithreaded applications.
    • Some good outputs of your structures
    • Do not print the rule with only% d, use some toasting () or some EnumToString (
    • Unit Testing
    • "Audiovisual" Monitoring: If something happens
      • Use buzzer
      • Run the system sound
      • Defeat

        without re-assignment
        • if you have a few LED flash enabled in the DWARPE GPO line (in embedded scenarios only) The application uses any type of network: or I will only choose for you:
        • If you use the database: Monitor queries send the database and the database itself.
        • Use virtual machines to check the exact OS / hardware setup that your system is running.
        • Use any type of system call monitor in it on the Unix box or
        • Pre-tools on Windows tools, and evenly
        • Windows GUI stuff In the situation: For check out or WPF (although the second I did not use)
        • Consider using some profile tools for your platform, this will give you an overview of what happens in your app. Hardware Monitoring: Use Oscilloscope (aka O-Scope) Monitor Signals on Hardware Lines
        • Debugging Source Code: You Can Use Your Source Sits with the code and pretends only pieces of paper and pencil that you are a computer, its so called code analysis or "on-eye-eye" debugging
        • Source control debugging when "this" works And now you have to differentiate your code from time to time.
          • Text from the column and Pivot table provides some incredible analysis packs with some text tools (with awk , grep or perl ) if you have If you have more than 32 records, consider using access as a data source.
          • With simple cube, you can analyze floating data in no time.
          • Your application is worth mentioning for dumping either as a result of the accident or on a regular basis
          • always That) to generate.
          • Approximate but least: Most Mayor platforms have some type of command line debugger (even Windows!). With some tricks such as conditional debugging and brake-print, you can get very good results with an obscure bug
          • And in fact, last but not least: use your brain and questions Everything .

          In general debugging is like science: you do not make it, you know it. Often it's like looking for a killer in a criminal case. So buy yourself and do not give up.


Comments

Post a Comment

Popular posts from this blog

MySql variables and php -

-
I am getting an error with php in order to format mysql_query () in php to format this string What is the right way? SELECT SELECT SELECT (*) Agents @AgentCount; User_Agent_English, User_Angent_Oursal, US.___Gent_Aginal, COUNT (User_Agent_Percade) ACC, COUNT (*) / (AgentCount) Percentage by agents user_agent_preser order DEC limit limit 50; In PHP, how am i setting $ query $ query = "SELECT count (*) agents @ agentcount; SELECT user_agent_parsed, User_agent_original , COUNT (user_agent_parsed) ascount, COUNT (*) / (@AgentCount) as a percentage by user_agent_parced by URI date DESC limit 50 "; This exact query will work properly if I put it in MySQL directly through a command line session. Do I need to release two separate php calls from mysql_query () and store the results first? I get the following error: There is an error in your SQL syntax; Instead of using a sub-selection and instead of using the 'SELECT user_agent_parsed, user_agent_original, ne...
Read more

url rewriting - How to implement the returnurl like SO in PHP? -

-
This URL should work even after the rewrite. Is this possible? Otherwise, I can only hardcoded everything If you are trying to create a login system with redirection You need to use the HTTP_REFERER header to find out where the user came from so that you can send it back there. The best way to do this is to use something like this in your login form: // - Login php & Lt; Input type = "password" name = "password" /> & Lt; Input type = "hidden" name = "returnrelale" value = "& lt ;? php echo $ redirectURL ;? & gt;" / & Gt; & Lt; / Form & gt; Please note that some ISP, browser or proxy will delete the referrer header, so you can not rely on each user to work fully. If you use a statement, to check whether the header exists or not, you can send those users back to the homepage or whatever. Edit If you are looking to use $ _SERVER ['REQUEST_URI'], if you are running Apache It sho...
Read more

Which Python client library should I use for CouchdB? -

-
I am starting to experiment with CouchDB because it looks like we have the right solution to certain problems That all the work will be on a new project, which does not have any legacy dependency, which the client library will suggest you use, and why? If we overlap any of the OS. Freeband is available only in the collection of its ports, but asks to use the library's project website. None of those people are Ubuntu, which is only with ships, since those two OSAs are not common in libraries, I am probably installing something from source (and hopefully if I have time, then Ubuntu and FreeBSD People pack the package). For those interests, I want to use CouchDB as a convenient intermediate storage space for data passed between different services - think of a message bus system, but less formalities with. For example, we have daemons that download and pars the web page, then send an interesting bit to other daemons for further processing. Many of them are ill-defined until the...
Read more