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Scratch is used as the introductory language because the creation of interesting programs is relatively easy, and skills learned can be applied to other programming languages such as Python and Java. Scratch is not exclusively for creating games. With the provided visuals, programmers can create animations, text, stories, music, art, and more.
Specifically, C allows a void* pointer to be assigned to any pointer type without a cast, while C++ does not; this idiom appears often in C code using malloc memory allocation, [9] or in the passing of context pointers to the POSIX pthreads API, and other frameworks involving callbacks. For example, the following is valid in C but not C++:
Snap! caches the shapes of sprites so the sprite doesn't have to be re-drawn onto a new Canvas element every time the mouse moves over its bounding box. It does not cache blocks, however. Instead it manages the insides of C-shaped blocks through the morphic "holes" mechanism.
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The D programming language does not do that since it maintains some compatibility with C, and "Allowing C expressions but with subtly different semantics (albeit arguably in the right direction) would add more confusion than convenience". [7] Some languages, like Common Lisp, use multiple argument predicates for this.
Scratch, a small amount of extra money; Old Scratch or Mr Scratch, a figure representing the devil; Scratch building, creation, from raw materials, of architectural scale models; Scratchcard (or scratch card, or scratcher), a small card with one or more areas containing concealed information which can be revealed by scratching off an opaque ...
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C Traps and Pitfalls by Andrew Koenig; C++ Gotchas A programmer's guide to avoiding and correcting ninety-nine of the most common, destructive, and interesting C++ design and programming errors, by Stephen C. Dewhurst