run a loop for a from 0 to 9999 ● see (a+"").length() , if it is k, then add (4-k) zeores before printing a //one more idea if not want to get into length(), Strings etc, just use conditions like <10, <100 & <1000 to know number of digits in number & add zeroes in front accordingly [but will become tiring work to write code if the pin will be of high number of digits so it would be better to make code working for any general number of digits].

run a loop for a from 0 to 9999 ● see (a+"").length() , if it is k, then add (4-k) zeores before printing a //one more idea if not want to get into length(), Strings etc, just use conditions like <10, <100 & <1000 to know number of digits in number & add zeroes in front accordingly [but will become tiring work to write code if the pin will be of high number of digits so it would be better to make code working for any general number of digits].

C++ Programming: From Problem Analysis to Program Design

8th Edition

ISBN:9781337102087

Author:D. S. Malik

Publisher:D. S. Malik

Chapter5: Control Structures Ii (repetition)

Section: Chapter Questions

Problem 14PE

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