Question

Which among the following function can be called without arguments?

(a) void add(int x, int y=0)

(b) void add(int=0)

(c) void add(int x=0, int y=0)

(d) void add(char c)

I got this question during an online interview.

My question is taken from Default Arguments in division Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

Answer 1

Right choice is (c) void add(int x=0, int y=0)

The best explanation: For the function to be called without arguments, either it must have zero arguments or it must have all the default arguments. Here the function in option void add(int x=0, int y=0) have all the default arguments and hence can be called directly with zero argument.