In the variable x I will enter the folder name. Further, the program in a certain place, for example, in folder 3 ( C:\папка1\папка2\папка3 ) should create a folder with the name I entered.
For example, it is not clear to me how to "associate" a variable with the MkDir function and where to write the path C:\папка1\папка2\папка3 ?

What in this code to add and / or change?

 var x : string; begin Writeln('название папки?'); Readln(x); MkDir() end.
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2 answers 2

Try this:

 var x,y : string; begin y := 'c:\папка1\папка2\папка3'; Writeln('название папки?'); Readln(x); MkDir(y+'\'+x) end.
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Another good rule is that the program does not crash to do a check.

 begin {$I-} // отключаем системную проверку Writeln('название папки?'); Readln(x); MkDir(x); // в текущей директории создаст. if IOResult <> 0 then WriteLn('Не могу создать папку.') else WriteLn('Папка создана!'); {$I+} end.

In general, in Pascal, you need to constantly do such a check, turn off the system one and add your own, otherwise the program will constantly crash with a critical error. I know from my own experience for 4 years of programming on it. In the place where the folder cannot be created, you can return the user with the help of goto to the place where the folder name is entered. In general, check everything and always when you use system things.

ps @insolor about how to link a folder and a variable.