From codeblocks.org, exactly 17.20 mingw.setup.exe I have installed code: blocks 17.20 and it works properly on C. Now I want to know about C++ and with console application I open C++ template ,where C++ I selected , with .cpp extension a C++ file opened , "include <iostream>" it starts with this. If I try to shift <iostream> into <iostream.h> , "fatal error iostream.h: No such file or directory". I got this error after manual.
The current version of Code::Blocks is 20.03, 17.12 is old and outdated. To a lesser degree so is 20.03, though the compiler used can be updated with a bit of work.
@LunaElla, do you want to use an obsolete header? The proper C++ header is <iostream>, not <iostream.h>.