What is code block....???

Answer 1

It is a free, open-source cross-platform IDE that supports multiple compilers including GCC, Clang and Visual C++. It is developed in C++ using wxWidgets as the GUI toolkit. Using a plugin architecture, its capabilities and features are defined by the provided plugins.
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Answer 2

Code block may be just a piece of code ...
or maybe you are talking about Code::block, the IDE. ..