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Why is there a compile error here?

Why is there a compile error here?


Course: https://www.educative.io/courses/learn-object-oriented-programming-in-cpp
Lesson: Quiz - Learn Object-Oriented Programming in C++

num is declared as a private variable in the Score class. In the main, we are trying to access the num, but since it’s a private variable in the Score class, we cannot access it, which results in a compiler error.

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