Here are some bugs that prove that iPhone calculator is kind of screwed at this moment. Maybe some will say "Why you need a 'proper' calc on iPhone - will you use it?". Though, provided Stocks app oriented on business users - they might need proper and reliable (!!!) figures calculation

I know it is not a science calc, but at least it could do a decent math with limited precision. And btw - the .0000000000 crash is nice - more likely it bumps into a devision by zero, but i am not very sure