First of all, the path should not have any starting, because this makes it an absolute path, so it will eventually search on C:Data. Second, the.txt extension is not optional! You might hide it in File Explorer, but it's still there. Also, there's no need for parentheses, they don't do anything there.The line in question should be something like this: String path = 'DataLow256.txt';Note that this assumes that your program will be at the output directory and the text files in a directory called 'Data' inside that directory. That looks like a totally separate issue.
Don't ever do anything directly with console.readline except store it in a variable. Then you can do some basic checking before passing it on to another function.
Reference File In C# Project
Especially since there is user input involved you should put that convert inside a try.catch.also use bool success = int.TryParse(input, out int result);with that it won't throw an exception if the format is bad, and you can decide using success what to do. If success is true, result contains your number. Personally I'd recommend creating an installation program for your program that includes and installs the relevant data files in a controllable place, for example in the user's appdata folder. Then in c# you can ask the system where the appdata folder is.
C Thomas Howell
There are many good choices for making an installer, but i use inno setup.If you don't expect these files to change, can you compile them or the data into your program directly? If you do expect them to change then storing them with your program is not a best practice. Ah, one of those problems that makes you do certain things even if they aren't best practice.First go look at the build directory (inside your project folder, there is bin, and go from there). When VS copied the file to your output as you told it to as a build action, did it keep the folder structure or no?see the comment from below for a good way for your program to know where it is running from, then apply Path.Combine on that and what you learn about where the file is relative to your exe. Did you try the debugger and step through each line?You know that there is different between comparing integer and string? '8 ' is not equal to '8' if both are strings.I would break down your code in to few different methods1) Method 1 - Read lines from the file and store in integer array - does line has one integer value or multiple via spaces?2) Method 2 - take integer array and target array and return matching new array with matching numbersIt's a homework so you should try to do few small console apps and put all together at end.:).
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