Zero Division, Error Error?

What this C++ floating-point edge case tests

This is a quick easy question about how C++ handles division at the boundaries of floating-point arithmetic. It checks whether you know the actual behaviour of the language and standard library, rather than assuming that all invalid operations throw errors or crash.

Understanding floating-point semantics—including special values like infinity and NaN, and how they propagate through arithmetic—is essential for any systems programmer or quant developer. These corner cases often surface during code review or in edge-case testing, and getting them wrong can lead to silent bugs that are hard to trace.

• IEEE 754 floating-point representation and special values
• Undefined behaviour vs. well-defined language semantics in C++
• How standard library functions handle exceptional cases