Virtual base class C++ Program to pattern like a pyramid repeat the number

Write a program in C++ to make such a pattern like a pyramid with a number which will repeat the number in the same row by using the virtual base class in Object Oriented Programming.

Output

Print pyramid pattern using do while loop c++

Develop a C++ Program to print the pattern like a pyramid repeating  the number  by using the  Virtual base class in OOP.

Develop a C++ Program to print the pattern like a pyramid repeating  the number  by using multi level inheritance and virtual base class.

Develop a C++ Program to print the pattern like a pyramid repeating  the number  by using the  Virtual base class with for loop.