Question

Hello well all is in the title. The question apply especially for all those values that can be like NSTimeInterval, CGFloat or any other variable that is a float or a double. Thanks.

EDIT: I’m asking for value assignment not format in a string.

EDIT 2: The question is really does assigning a plain 0 for a float or a double is worst than anything with f a the end.

Answer 1

The basic difference is as :

1.0 or 1. is a double constant

1.0f is a float constant

Without a suffix, a literal with a decimal in it (123.0) will be treated as a double-precision floating-point number. If you assign or pass that to a single-precision variable or parameter, the compiler will (should) issue a warning. Appending f tells the compiler you want the literal to be treated as a single-precision floating-point number.