Variadic functions accept a variable number of arguments but are problematic. Variadic functions define an implicit contract between the function writer and the function user that allows the function to determine the number of arguments passed in any particular invocation. Failure to enforce this contract may result in undefined behavior. See bullet 133 of Appendix J of C99.
Argument Processing
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In the following code example, the variadic function {{average()}} calculates the average value of the positive integer arguments passed to the function \[[Seacord 05c|AA. C References#Seacord 05c]\]. The function processes arguments until it encounters an argument with the value of {{va_eol}} ({{\-1}}). |
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