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bagelturf/nsdecimalnumber.m

Created September 17, 2013 04:03
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Using NSNumberFormatter to read in decimal numbers has rounding problems. However decimalNumberWithString can't grok currency symbols, so I'm using NSNumberFormatter.
Raw
nsdecimalnumber.m
NSLocale *locale = [NSLocale localeWithLocaleIdentifier:@"en_US"];
NSNumberFormatter *inputFormatter = [[NSNumberFormatter alloc] init];
[inputFormatter setLocale:locale];
[inputFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[inputFormatter setLenient:YES];
[inputFormatter setGeneratesDecimalNumbers:YES];
NSDecimalNumber *a = (NSDecimalNumber *)[inputFormatter numberFromString:@"87.85"];
NSDecimalNumber *b = [NSDecimalNumber decimalNumberWithString:@"87.85"];
NSString *pa = [a descriptionWithLocale:locale];
NSString *pb = [b descriptionWithLocale:locale];
NSLog(@"%@",pa); // prints 87.84999999999999
NSLog(@"%@",pb); // prints 87.85
@mackuba
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mackuba commented Nov 5, 2013

Just out of curiosity, have you found a way to convince NSNumberFormatter to actually generate decimal numbers without going through floats in between? I'm having the same problem... I don't want to use decimalNumberWithString because the decimal separator symbol might be different depending on locale.

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