parameter name omitted, C++ vs C

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No, in C you cannot omit identifiers for parameters in function definitions.

The C99 standard says:

[6.9.1.5] If the declarator includes a parameter type list, the
declaration of each parameter shall include an identifier, except for
the special case of a parameter list consisting of a single parameter
of type void, in which case there shall not be an identifier. No
declaration list shall follow.

The C++14 standard says:

[8.3.5.11] An identifier can optionally be provided as a parameter
name; if present in a function definition , it names a parameter
(sometimes called “formal argument”). [Note: In particular, parameter
names are also optional in function definitions and names used for a
parameter in different declarations and the definition of a function
need not be the same.]

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