const type qualifier soon after the function name [duplicate]

Answer 1

It means that it doesn't modify the object, so you can call that method with a const object.

i.e.

class MyClass {
public:
   int ConvertToInteger() const;

};

Means that if you have

const MyClass myClass;

you can call

int cValue = myClass.ConvertToInteger();

without a compile error, because the method declaration indicates it doesn't change the object's data.