How to add percent sign in string format and using swift language?

Question

I want to get string like "99.99%" from Double,and I used format to get this:

let rate = 99.99999
let str = String(format: "%.2f%", rate)
// output 99.99

And \% is not allowed. So how to add percent sign in string format, please help me!

score 169 · Accepted Answer · edited Nov 15 '21 at 09:02

169

write % twice:

rate = 99.99
let str = String(format: "%.2f%%", rate)

edited Nov 15 '21 at 09:02

ramzesenok

answered May 25 '16 at 06:39

You can write it once in regex pattern string field – coolcool1994 Apr 18 '20 at 20:11
1

Anyone knows why this works and why `%` can't be escaped with a backslash? – ratsimihah Aug 12 '20 at 07:34
Because % is handled and has a meaning in string format method, it is not treated as a special character by this method. – Prike Jul 28 '21 at 09:57

score 16 · Answer 2 · edited Jun 12 '16 at 22:43

16

The % symbol has a special use in a printf statement. How would you place this character as part of the output on the screen?

You can do this by using %% in the printf statement. For example, you can write printf(“10%%”) to have the output appear as 10% on the screen.

Hope it help you :)

edited Jun 12 '16 at 22:43

Undo

answered May 25 '16 at 06:49

Darshan

1

It works. In my case I'm using a string like "There is a %@ probability" So the solution was: "There is a %@%% probability" – Dasoga Aug 15 '18 at 15:23

2 Answers2