Answer 1

Neither the C nor C++ standard places an absolute requirement on the number of arguments/parameters you must be able to pass when calling a function,

but the C standard suggests that an implementation should support at least 127 parameters/arguments, and the C++ standard suggests that it should support at least 256 ...

https://www.quora.com/How-many-maximum-arguments-can-be-passed-to-a-function-in-C