> not random

Not so sure about that. Here's a mistake: have a floating point variable somewhere and then don't initialize it. On it's first use, multiply it by 0.0. What do you think the chances are the result is 0.0? Hint: nan * 0.0 == nan, and there are many nan representations out there, so it solely depends on what pattern the memory location for that variable is initialized with. So unless your compiler created a bunch of code to initialize the memory for you, which it does not always do, I'd consider that pretty random.