Mastering C++ 2025 – 400 Free Practice Questions to Pass the Exam

When a variable's constness is cast away, it means that the variable can now be modified even though it was declared as const. This can lead to potential issues with code safety and introduces the risk of bugs. Modifying a variable that was intended to be constant can lead to unintended consequences and errors in a program. Options A and C are incorrect because casting away constness does not directly impact memory usage or code performance. Option D is incorrect because casting away constness does introduce a potential risk.