Which program can you use to write C Plus Plus scripts?

You can use any text editor you want, say notepad in Windows and vi in unix. You can also use MS Word, but you need to save in text format, i.e. with no formatting, because the compiler only understands the text, and not the formatting.

Often, however, the text editor is part of an integrated development environment, that makes it easier to highlight code and errors, organize classes and modules, and to debug visually. In the Windows environment, that might be Visual Studio, but it can be any supported product for your platform.