CODEWITHSUNDEEP
objective-c
user265961
user265961

Reputation: 1373

How can I do accurate decimal number arithmetic since using floats is not reliable?

How can I do accurate decimal number arithmetic since using floats is not reliable? I still want to return the answer to a textField.

Upvotes: 1

Views: 482

Answers (2)

kennytm
kennytm

Reputation: 523774

You can either use int-s (e.g. with "cents" as a unit instead of "dollars"), or use NSDecimalNumber s.

Upvotes: 2

Ira Baxter
Ira Baxter

Reputation: 95420

Store your number multiplied by some power of ten of your choice, chosen by the amount of precision you need to the right of the decimal point. We'll call these scaled numbers. Convert entered values that need your precision into scaled numbers. Addition is easy: just add. Multiplication is slightly harder: just multiply two scaled numbers, and then divide by your scale factor. Division is easy: just divide, then multiply by the scale factor. The only inconvenience is you'll have to write your own numeric input/output conversion routines.

Upvotes: 0

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