Explain the value of variable-length argument lists. What distinguishes such lists in Java and C# from their counterparts in C and C++? Describe three common mechanisms for specifying the return value...

Explain the value of variable-length argument lists. What distinguishes such lists in Java and C# from their counterparts in C and C++? Describe three common mechanisms for specifying the return value of a function. What are their relative strengths and drawbacks?