CODEWITHSUNDEEP
objective-cstringnsstringdouble
thedp
thedp

Reputation: 8516

Objective-C: Convert the entire double value to string without losing data

I have the following double value: 0.000900137869045636 which I would like to convert to a NSString.

I've tried the following code, but no matter what, it rounds the value to this: 0.000900138

[NSString stringWithFormat:@"%.20lf", [currentLocation coordinate].latitude];

What should I do to keep the double number as it is?

Thank you.

Upvotes: 21

Views: 33196

Answers (3)

CRD
CRD

Reputation: 53010

Short answer: use %.18lf - tested with 0.000900137869045633 -> 0.000900137869045639. But don't kid yourself this is precise, it works only due to rounding.

Upvotes: 2

Ahmed Masud
Ahmed Masud

Reputation: 22412

There doesn't seem to be ANY issue with your code as far as I can see: I just tried the following and 

int main(int argc, const char * argv[])
{

    double foo = 0.000900137869045636;
    NSLog([NSString stringWithFormat:@"%.20lf", foo]);

    return 0;
}

the log output is:

2013-05-10 14:00:18.492 Test[71101:303] 
0.00090013786904563598

So not sure what your issue is, but it's not in the NSString creation.

Upvotes: 0

m177312
m177312

Reputation: 1209

Create an NSNumber using

NSNumber *myDoubleNumber = [NSNumber numberWithDouble:myDouble];

Then call

[myDoubleNumber stringValue];

Upvotes: 54

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