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how i can implement variable length data base ( or data storage structure)in keil C programe?
oh! sorry, i m designing C8051F020 based collage student data logger in which i m entering whole details of student (student database) & used for smart card system.
Then I would suggest something simple, like a ring buffer. Easy to throw away old entries when new data arrives and you can't read out the current log.
You will have to compute yourself your needs.
How large user ID number for each log entry? How much data for the time stamp? Depends on how long time you must be able to span, and your required resolution. How much data for additional information, such as ok/fail on PIN code entering etc.
But your project includes thinking about these kind of things. You will have to make a design. You will then have to review it. Then you will have to modify any weak spots you find. Then you implement and debug.
But your project includes thinking