Question

I see several programmers, including Apple, creating codes where they declare stuff like this:

CGRect myRect = CGRectMake (0.f, 0.f, 20.f, 10.f);

or

[myView setAlpha:.7f];

instead of

CGRect myRect = CGRectMake (0.0f, 0.0f, 20.0f, 10.0f);
// and
[myView setAlpha:0.7f];

what the advantage of doing that? Smaller final binary? Faster code?

thanks.

Answer 1

This is just laziness/taste: both 0.f and 0.0f as well as .7f and 0.7f produce exactly the same floating point numbers. There is no difference whatsoever, it’s only that the C syntax allows to omit the zero before or after that dot.