From "More Math" section:
Interestingly enough, if you are using a floating point type, like double or float, it doesn't crash. I don't know why the two categories are handled differently, but they are. Instead, you'll get the resulting value of Infinity. Which we'll discuss more… right… now….
I think the reason this happens is that Int, from what I think I understand, returns an Integer and not a "Real" number. The only way a value can return for 1/0 is if it is in fractional form, which I think you stated in a previous lesson. This is my guess as to why this happens…I'm sure you could probably word it a little better.