Use a text editor. Emacs, Brief, Vi, etc. to create a file in the language of choice (C, Fortran, Basic, assembly language). Then compile your file with the appropriate executable, and if it compiles, run it. If not, edit some more. Edit, compile, edit, compile, … repeat until no errors, run, go back and edit, compile,….
Old school programs that are the underpinnings of operating systems, compilers, etc. were done this way. Then at some point you use that method to write a GUI, and the more advanced languages and environments, and go up from there.
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