How do you start to analyze

Hi all,
How do you start to analyze previously coded programs?
For examle one comes and says you that I want this but you are new to company and do not know anything about the program.
Firstly you have to understand the code and then make the necessary modifications.
But how?
It is not easy as writting the program from the beginning..
Thanks.

Do one thing....
First read the documentation of the code,( if the documentation is there)...
Else, read the comments properly....You'll then have an idea of the code.
You see the output first, by just pressing F8 and observe the output.
Then start debugging the code, it might take a long time for the first 2-3 reports, but you'll be habituated.... All the best.
Regards,
Pavan

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