I like it too, to have just one file rather than many large and complicated files. Some programs I have seen do put everything in the header file, although I pr

I like it too, to have just one file rather than many large and complicated files. Some programs I have seen do put everything in the header file, although I prefer to have a separate header file and program file, although having only the header file still works too. It isn't impossible to invoke from two separate source files, because there is a macro that you can define to specify if you want to include the implementation or not.