Asking about function overloading here.

Question

What if I declare to functions : int sum(int a, int b = 0) and int sum(int a, float b =50) that just add a and b and return an int. What would be the result of sum(int 10) : 10 or 60?

Answer 1

This can be an example of undefined behaviour.
There are a lot of undefined behaviors on c++

It's your responsibility to write good codes and avoid strange logics.. if it's not clear what your code will do it's simply won't be a good code.

You should always strive for simply and readable codes, it will be good for clients (you often will be client of yourself)

Answer 2

This could depend on the language, compiler, version, and/or order of the code, the function name lookup table, in addition to whether or not the language has a type precedence for ambiguous function/method calls. This all results in the overload resolution.

C++
http://en.cppreference.com/w/cpp/language/overload_resolution
Will most likely result in a compile time error.

Java
http://javabypatel.blogspot.in/2016/05/ambiguous-method-overloading.html
https://docs.oracle.com/javase/specs/jls/se8/html/jls-15.html

Answer 3

What language do you use ?

Answer 4

Ok guys I was just wandering while reading the cpp course. Undefined behavior looks bad, I'll make sure to avoid it! Thanks a lot, great community 🤘