Close
enough?

Computers are brilliant at whole numbers. Decimals are where things get weird. Most values cannot be represented perfectly in binary, so the machine stores the closest version it can.

That means a calculation can be mathematically correct and still land a microscopic distance away from the answer. Usually, nobody notices. In real-time embedded systems, that tiny difference can accumulate, change a threshold, or arrive one interrupt too late.

Working on brain-computer-interface firmware taught me that engineering is not just asking, “Is this right?” It is asking, “How wrong can this safely be—and how quickly do we need to know?”

That balance between precision, latency, memory, and hardware is what makes low-level software so fascinating: every approximation has a cost, and every saved cycle has a reason.