iOS Nearest point of intrest

[alexandergre]

There are 5 restaurants with diffrent longitudes and latitudes.
You current location is x.
And the application wants to find the 3 nearest restaurand to X.


the Question is:
Where and how shall I save the 5 restaurants with their longs and lats? in a database? array?
so that the 'distance calculation process' willl be as easy as possible.

 

[KoolStar]

Store the data in coreData or dictionaries. This is the equation that I used to calculate distance between gps points for some of my stuff.
dist = (((acos(sin(lat1 * pi() /180) * sin(lat2 * pi() /180) + cos(lat1 * pi() /180) * cos(lat2 * pi() /180) * cos((lon1- lon2) * pi() /180)) * 180.0) / pi()) * 60 * 1.1515) * 1.609344;

lat1/lon1
lat2/lon2
are the respected pair of gps coordinates.
The last 1.609344 converts the distance to miles otherwise its in KM.

There are 5 restaurants with diffrent longitudes and latitudes.
You current location is x.
And the application wants to find the 3 nearest restaurand to X.


the Question is:
Where and how shall I save the 5 restaurants with their longs and lats? in a database? array?
so that the 'distance calculation process' willl be as easy as possible.

 

[alexandergre]

Thank you KoolStar. I have looked at coreData and dictionaries. But still I decided to go with SQL. Every thing works well except SORTING
I have a class and it stores the info from the database:

Object.m

Object *myObject = [[Object alloc] initWithPrimaryKey:primaryKey];
myObject.Name = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];	
myObject.Price=sqlite3_column_int(selectstmt, 2);
[appDelegate.ObjectArray addObject:myObject];
[coffeeObj release];

Basicly all the items in the database are stored in a NSMutableArray called ObjectArray.and to show the item into a UITableView :

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

%%%

//Get the object from the array.
Object *myObject = [appDelegate.ObjectArray objectAtIndex:indexPath.row];
[cell setText:[NSString stringWithFormat:@"%i€    -     %@",myObject.price, myObject.Name]];

the items are shown correctly in the UITableView.
but how can I sort them inside the array?(I think I have to sort the array where I typed %%%)

this doesnt work:
NSArray *sortedArray =[appDelegate.ObjectArray sortedArrayUsingSelectorselector(caseInsensitiveCompare];

tips?
thanx dude