Question

I am trying to convert a string to a double value to use it as a coordinate in an annotation.

I need the double value to have 5 decimal places to be placed on the map.

Let’s say the string is hello and the double I need is whatsup.

The format of the string is exactly the way I want it and I want to make it a double, so I use the doublevalue property of the string.

NSString *hello = @"12.61655";
double whatsup = hello.doubleValue;
NSLog(@"%f",whatsup); //this gives 12.616550 WITH A ZERO in the end
NSLog(@"%.5f",whatsup); //This gives me the correct value of 12.61655 with only 5 decimal places

So now if I want to write:

coordinate.latitude = whatsup 

it gives the double with the extra zero.

How can I write

coordinate.latitude = SOMETHING HERE 

which is the double with only 5 decimal places?
Can I implement the “%.5f” here somehow?

Have tried the numberformatter but it gives me an NSnumber. I need a double:

I am using this code in a for loop to plot the annotations (pins).

When i use the same forloop with doubles I hardcode it works fine. But when I use this code to get the values from the csv file, I dont get any pins:

double latitudeFromCSV = [[components objectAtIndex:0] doubleValue];
double longitudeFromCSV = [[components objectAtIndex:1] doubleValue];
CLLocationCoordinate2D annotationCoord;
annotationCoord.latitude = latitudeFromCSV;
annotationCoord.longitude = longitudeFromCSV;

Answer 1

Check out the NSString method -stringWithFormat:

But to make it good you’ll need to remove the leading zeros as you can’t know there will be no value like @”12.50000″.

---

NSNumberFormatter * nf = [[NSNumberFormatter new] autorelease];
nf.maximumFractionDigits = 5;
NSLog(@"%@", [nf stringFromNumber:[NSNumber numberWithFloat:@"12.61655f".doubleValue]]);

should give you 12.61655 as an output string.