number is existing ?

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how to make a program that show me if the number exists in the file text or no plz help
I would recommend you start by creating a main function, then take it step by step.

On a more serious note, work on it yourself first. It's quite easy to find information on google and youtube if you try. Once you've worked on it and get stuck on a specific thing, you can post your code and errors if you have any, and we can help you out.
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