Question

I have two text fields in my view. After prompting the user to enter a value, I convert them to floats to do my calculations.

I use the following code:

variable1 = [textField1.text floatValue];
variable2 = [textField2.text floatValue];`

When the user enters 22.8 in textField1, I get 22.80005 in variable1.

I do not get the exact value!

How do I get the exact decimal value? Any addition could affect the accuracy of the calculations.

Answer 1

And another question hits SO about floating point accuracy!

You should use NSDecimalNumber instead:

NSDecimalNumber *variable1 = [NSDecimalNumber decimalNumberWithString:[textField1 text]];
NSDecimalNumber *variable2 = [NSDecimalNumber decimalNumberWithString:[textField2 text]];

There’s some more info in the Number and Value Programming Guide.