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    From the perspective of compilers/interpreters implementation, C has been/is a reference point. In addition it has directly or indirectly influenced many later languages (at least syntactically). Commented Dec 22, 2014 at 10:41
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    pretty soon, you'll be able to say that C# was written in C#! (kind of) Commented Dec 22, 2014 at 18:44
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    Most of Mono (which includes a C# compiler and many/most of the .NET base class library) is written in C#. Commented Dec 23, 2014 at 6:31
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    The answer to the question "is C the mother/father of all languages?" is "no", so I don't think it's helpful to provide lots of examples which are written in C. Counter-examples would help, but your choices are still descended from C. For example, even if Java, Python, etc. are now self-hosting, they were still bootstrapped from C, so they're like "grandchildren" of C. Languages like LISP, FORTRAN, ML and (of course) machine code are true counter-examples, since C was never involved in their creation. Commented Dec 23, 2014 at 18:39
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    The aspiration for many languages is, of course, to be implemented as far as possible in itself. However, it seems like most languages depend on C because most languages need to be able to call C to be useful; the majority of modern operating system APIs and useful libraries tend to have C bindings. You also have to be careful about what you mean by "written in". A language implementation typically has multiple parts: at least a compiler and a runtime system. Runtime systems are often written in C to better interface with the OS. Commented Dec 24, 2014 at 0:21