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Please have a look on this scanned page:

http://img257.imageshack.us/img257/8175/chap11page191.jpg

I humbly request you to be precise and to the point in your replies. I need you help and need to understand this as soon as possible. Thank a lot.

Suppose there were 100 students and once it has processed the percentage of the last student (100th) it writes output data and then goes back to first step "Read Input Data" as the 'arrow line' suggests. Well, there is any more Input Data so the program will keep on looking for the Input Data. How is it suppose to lead to the step "Is Roll no. = 0000000" - a sentinel value? I don't understand it.

Please help me.