kCFNumberFormatterScientificStyle and kCFNumberFormatterDecimalStyle hybrid? - iphone / objective-c

Question

in objective-c or iphone development has anyone ever done dynamic number formatting - something along the lines of "use kCFNumberFormatterDecimalStyle until the number gets too big, then use kCFNumberFormatterScientificStyle instead?"

i want to display a number with some sort of hybrid between the two, but i'm having a little trouble with implementing it. thanks in advance.

Answer 1

I'd say create a method for that somewhere:

NSString *NSStringFromNumberInHybridStyle(NSNumber *aNumber)
{
    if ([aNumber intValue > 100]) {
        // format with kCGNumberFormatterDecimalStyle
    } else {
        // format with kCGNumberFormatterScientificStyle
    }
}

Answer 2

An other way would be selecting the formatter inline using the elvis operator:

// assuming you have formatter declared previously
// and x is the float NSNumber you want to format

formatter = ([x floatValue] < 1000.0) ?
               kCGNumberFormatterDecimalStyle :
               kCGNumberFormatterScientificStyle;

// Format with formatter

You would probaly want to put all of this in a #define or a method though.