How to Turn Number into a String with Format?

Say I have a number, double, or NSNumber, 3.3333开发者_如何学Go33

I want that to turn that into @"3.3"

How would I do so?

Can I do NSString stringWithFormat? But what's the format?

NSString *str = [NSString stringWithFormat:@"%.1f", yourDouble];

or for NSNumber:

NSString *str = [NSString stringWithFormat:@"%.1f", [yourNSNumber doubleValue]];

0.0f means the amount of digits before and after the decimal. So @Wevah's answer would be correct, but keeping that in mind will save you time in the future.

%f stands for a float variable which I am sure you understand. What you would need to display this is a float variable because it contains a decimal. Like people have stated before, you will need to use %.1f The % just tells the compiler that a special character is coming up. The f tells the compiler that it is a float variable. The .1 tells the compiler how many decimal places your float variable is to have. If you would want to have 6 decimal places, then you would us %.6f

Yes, you will want to use string with format. Say you have a UILabel, then you will want to say

theLabel'sName.text = [NSString stringWithFormat:@"%.1f", ((float)int1 / int2)];

You need the (float) to tell the compiler that whatever int1 / int2 is, is a float variable.

If your NSNumber instance is called myNumber then do

[myNumber stringValue];