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How to catch numbers typed in pascal


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Hi there.. im doing a program for my class and now im having a problem here.. im converting numerci bases ( decimal => hexadecimal, octal => decimal, etc ), but my problem is that i dont get how to validate typed numbers.

For example when im converting from binary to any base how can i get the values or the keys pressed by the user.. and dont allow number > 1 and tell the user to type the right numbers... and the same with octal..

Heres the code in an attachment.. hope you can help

Thanks!

program.txt

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