Formatting float to show only 5 figures

Question

I have a float number that could be 3.553 or 34.535 or 353.6436 I want it to be no more than 5 figures, before or after the dot, for example, for the first number I wrote it has to be 3.5530, for the second 34.535 as is and for the third 353.64.

How can I do that with NSNumberFormatter?

what do you want to be shown if your number is "123456"? – Michael Dautermann Oct 25 '14 at 00:41 — Michael Dautermann, Oct 25 '14 at 00:41
@MichaelDautermann Only 12345, just the first 5 figures. – ytpm Oct 25 '14 at 00:44 — ytpm, Oct 25 '14 at 00:44

score 2 · Accepted Answer · answered Oct 25 '14 at 00:56

Use NSNumberFormatter to convert the number to a string. Specify 5 decimal digits and turn off any grouping. Once you have the string, get the index of the decimal separator. If its index is 4 or less (a number less than 10,000), take the first 6 characters of the string. If its index is 5 or more (a number greater or equal to 10,000), take the first 5 characters of the string.

You may have to adjust this depending on how you want to deal with numbers less than 1 due to the leading zero ahead of the decimal separator.

I thought of something built in NSNumberFormatter, but that's works great, so why not? :) Thanks man! — ytpm, Oct 25 '14 at 09:34

Formatting float to show only 5 figures

1 Answers1