Building a Simple Circuit Resistance Calculator in C++ (and a logic trap to avoid)

Every programmer has, at some point, fallen into a logical trap. While building a simple console-based electrical circuit simulator in C++, I stumbled upon a classic boolean logic mistake that completely broke my code. Here is how to build this useful engineering tool and, more importantly, how to avoid the infinite loop trap! ⚡ The Goal: An Equivalent Resistance Calculator In physics, calculating the total resistance depends on how components are linked: Series: R_total = R1 + R2 + ... + Rn Par