Nested while loop [Closed]

Registration date
Sunday December 11, 2016
Last seen
December 11, 2016
Can any one explain nested while loop with input and output.

how to give inner while loop updated values as a input to the outer while loop?

I am to totally confusing. 1st iteration of outer while loop, I am doing add/subtract in inner while loop and updated some columns.

2nd iteration of outer while loop, will go to the inner while loop its not showing the updated values. why?

how to get the 1st iteration values, in the 2nd iteration?

Please any one explain me clearly with example input and output?

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