I need c++ code

Problem statement: Write a code/algorithm, which takes two sorted integer stacks 'intstack_1' and `intstack_2' (with minimum value on 'top' and the maximum value at the bottom) as input. The algorithm should output a single sorted stack result_stack of all the values (with the minimum value on 'top' and the maximum value at the bottom). The algorithm should fulfill the following constraints: Only stack operations are allowed, and they are already implemented (pop, push, top, isEmpty, isFull etc.). No other data structure is allowed except stack. The algorithm must work correctly for input stacks of different sizes. [Hint: you will have to use an additional stack.]