Some programmers prefer LabVIEW programming, and others prefer text-based programming. How about being able to display your code as either a block diagram, as equivalent C code, or as a split screen with C (or C-like) code on top and the equivalent BD below it? Either one could be edited with a corresponding change to the other. I realize this would be a huge effort, but it might help attract the world of C-only programmers. A similar type of display is used by the Dreamweaver app for programming web pages.
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