Answer Posted / roshanpr

mutable key word is used when u want to make any member
variable of a const object modifyable.

Basically when u make a object constant u cannot modify its
data members. But during the declaration of the class if a
data member is declared as mutable it can changed.

Class my
{

mutable int age;

public:

my(){age=0;}
void plusplus(int b)const
{
age+=b;
}
};

int main()
{
const my obj;
obj.plusplus(40);
}

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