“f” after number

Question

What does the f after the numbers indicate? Is this from C or Objective-C? Is there any difference in not adding this to a constant number?

CGRec         


        

Answer 1

The f that you are talking about is probably meant to tell the compiler that it's working with a float. When you omit the f, it is usually translated to a double.

Both are floating point numbers, but a float uses less bits (thus smaller and less precise) than a double.