C99 doesn't need function bodies, or 'VLAs are Turing complete'

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Preface The 1999 revision to the C programming language brought several interesting changes and additions to the standard. Among those are variable length arrays, or VLAs for short, which allow array types to have lengths that are determined at runtime. These can show up in different contexts, but for the purposes of this post we will be looking at VLAs as parameters to functions. For example:…

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