The below is an algorithm to add two non-negative integers A and B.

A and B are binary numbers. They have been inputted as strings.

Given the initial values of A and B write an efficient C++ program to find out the number of times the while loop of the algorithm is repeated.

function add(A, B):    
while B is greater than 0: 
U = A XOR B 
V = A AND B 
A = U 
B = V * 2 
return An