HomePrintf debugging
One of the oldest methods of debugging is "printf debugging" - putting various print statements in the code and then staring at the output.
The information output may just be a short string to indicate that a particular point in the code has been reached or it might be a complete stack trace.
It is useful when you can't use a debugger. If the program does not crash, but produces wrong results after long computation, it's hard to figure where exactly the problem lies. In that case, printing intermediate data can be a very efficient method.
• Sometimes you need a lot of printf()'s, and it can get tedious putting them in and taking them out.
• In printf debugging, after adding print statements the program must be recompiled
• we can't use it on a running process
The information output may just be a short string to indicate that a particular point in the code has been reached or it might be a complete stack trace.
When do we use printf debugging
It is useful when you can't use a debugger. If the program does not crash, but produces wrong results after long computation, it's hard to figure where exactly the problem lies. In that case, printing intermediate data can be a very efficient method.
disadvantages
• Sometimes you need a lot of printf()'s, and it can get tedious putting them in and taking them out.
• In printf debugging, after adding print statements the program must be recompiled
• we can't use it on a running process
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