Incompatible const type qualifiers in C++

An error occurred while writing the program today   "Object contains type qualifiers that are incompatible with member functions." I looked it up on the web for this reason

Void showPair ();

to Void showPair () const;

In a function with something like the one shown above, if other functions are called, the other functions must have a const attribute as well, or you'll get an error with incompatible type qualifiers!

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