[masterdnater]

Hello everyone, I'm relatively new to obj-c and I'm having a strange problem with string to float conversion:

NSString *str=@"1.1";
float f=[str floatValue];

This sets the value of f to: 1.10000002. what's up with the 2 and how do I make f equal to str exactly?
Thanks in advance

[Chuckit]

Binary floating-point cannot precisely represent 1.1 — it's an infinitely repeating sequence of digits — so it uses a number very close to 1.1 that rounds to 1.10000002 in decimal. You should never, ever count on floating-point numbers to be accurate, and you shouldn't test for equality either — test whether a number is within a tiny range around the number you're interested in (e.g. x - 0.0000001 < n && x + 0.0000001 > n).