According to the C Standard, section 6.7.6.3, paragraph 14 [ISO/IEC 9899:2011],
An identifier list declares only the identifiers of the parameters of the function. An empty list in a function declarator that is part of a definition of that function specifies that the function has no parameters. The empty list in a function declarator that is not part of a definition of that function specifies that no information about the number or types of the parameters is supplied.
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Defining a function with a void argument list differs from declaring it with no arguments because, in the latter case, the compiler will not check whether the function is called with parameters at all [C TIGCC, void usage]. Consequently, function calling with arbitrary parameters will be accepted without a warning at compile time.
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In C++, foo() and foo(void) have exactly the same meaning and effect, so this rule doesn't apply to C++. However, foo(void) should be declared explicitly instead of foo() to distinguish it from foo(...), which accepts an arbitrary number and type of arguments.
Bibliography
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| ] | Foreword and section 6.9.1, "Function |
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| Definitions" |
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Bibliography
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| TIGCC, void usage] | Manual, "C Language Keywords": void |
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