real life scenario for private access specifier

Question

hi guys i am doing the c++ tutorials and i am a bit confused in the private specifier topic and want a fully explained real life scenario may be with a real life experience.....your answers are really appreciated

Answer 1

Collaborative projects editing files, hiding private 'things' from unwanted or untrusted eyes.
Function gathering all publically available classes in the same file and displaying in a list, for a developer to tinker with.
Just for fun, hide everything from a file reader so nothing can be read. Secret file, in concept, but not in approach.

Answer 2

I will use the vector class as an example.
The vector class contains an attribute (private) that is an array of elements of type we chose
Example :
vector<int> v;
If we could modify or access this attribute, I could very well do something like this :
delete v.array;
With this single line, my vector become broken and I can't use it anymore without having a Segmentation Fault as the memory of the array is now freed without the class to be able to know it.
That is why we use private attribute : for data hiding. With the array untouchable outside of the class, we are sure that the object (here vector) will always work the way we defined it to.