C - Reserved Keywords
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C - Reserved Keywordss

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The following names are reserved by the C language. Their meaning is already defined, and they cannot be re-defined to mean anything else.

auto else long switch
break enum register typedef
case extern return union
char float short unsigned
const for signed void
continue goto sizeof volatile
default if static while
do int struct _Packed

While naming your functions and variables, other than these names, you can choose any names of reasonable length for variables, functions etc.

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