If you are using floating point numbers implemented in hardware, then infinity is absolutely a valid value and one that your code will encounter. This is true r

If you are using floating point numbers implemented in hardware, then infinity is absolutely a valid value and one that your code will encounter. This is true regardless of language, as long as the language requires or allows IEEE-754 semantics. I am not aware of any language (outside of intentionally-minimalist esolangs) that doesn't support floating point numbers. In some languages (like JavaScript) that's the only kind of number you get.