Alogarithm steps:

Step 1: create a base class namely number and declare the pure virtual function  show().

Step 2: create the derived classes hextype, dectype & acttype from the class number

Step 3: create the objects for the class dectype, hextype and octtype. 

Step 4: call the member function show();

Step 5: Corresponding called function change the integer type as hex ,oct and decimal .

Step 6: Display the values.

CPP Program To Implement Pure Virtual Function

#include class number { protected: int val; public : void setval(int i) {val= i;} //show() is a pure virtual function virtual void show() = 0; }; class hextype : public number { public : void show () { cout<