Question

Which among the following is safe?

(a) Upcasting

(b) Downcasting

(c) Both upcasting and downcasting

(d) If upcasting is safe then downcasting is not, and vice versa

I have been asked this question in unit test.

Asked question is from Upcasting in portion Default Arguments vs Overloading, Upcasting and Downcasting of Object Oriented Programming

Answer 1

Right option is (a) Upcasting

The explanation: The upcasting is always safe since the derived type or the smaller type is converted into the base type or the larger size. This results in allocating a smaller size data into bigger type data. No data is lost in casting, hence safe.