nsdecimalnumber

I'm retrieving a key from an object that looks like this: po obj { TypeID = 3; TypeName = Asset; } The key value is being retrieved like this: NSString *typeId = (NSString*)[obj objectForKey:@"TypeID"]; Rather than typeId being an NSString, it is an NSDecimalNumber. Why is that? How do I convert it to an NSString? You need to use the stringWithFormat function: NSString *typeId = [NSString stringWithFormat:@"%@", [obj objectForKey:@"TypeID"]]; or stringValue : NSString *typeId = [[obj objectForKey:@"TypeID"] stringValue]; This should work: NSString *typeId = [[obj objectForKey:@"TypeID"]

I'm using numbers divided by 10^30 I may be adding values like 1000000000000000 and 5000000000000000 stored in NSDecimalNumber s. My concern is that I think I've seen a few times, when adding or subtracting these values, incorrect math being done. Is that a possibility or are NSDecimalNumbers pretty sound in terms of the integrity of their math. In answer to your question, the math offered by Decimal / NSDecimalNumber is sound, and the problem probably rests in either: The calculations might exceed the capacity of these decimal formats (as outlined by rob mayoff). For example, this works

I have a NSMutableArray which have some NSDecimalNumber in it, like (500,50.80,70,8000) Now I want to add all those decimal numbers together. I've tried to use for (NSDecimalNumber *number in self.numbersArray) { NSDecimal *sum += [number decimalValue] } But failed. Use - (NSDecimalNumber *)decimalNumberByAdding:(NSDecimalNumber *)decimalNumber Take a look at NSDecimalNumber Class Reference NSDecimalNumber *lNumber = [NSDecimalNumber zero]; for (NSDecimalNumber *number in self.numbersArray) { lNumber = [lNumber decimalNumberByAdding:number]; } A simple way to add all NSNumber s in an array is

ExclusivePrice, quantity are both NSDecimalNumbers. NSDecimalNumber *price = [exclusivePrice decimalNumberByMultiplyingBy:quantity]; NSLog(@"%@ * %@ = %@", exclusivePrice, quantity, price); The result I get: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = -0.0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007169919476068871316457914368 What I expected: 2010-04-05 00:22:29.111 TestApp[13269:207] 65 * 2 = 130 Can anyone explain this please? Edit: Full repro: NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; [formatter setNumberStyle

What's the easiest way to check if an instance of NSDecimalNumber is a whole number? Thanks! @interface NSDecimalNumber (IsIntegerNumber) @property (readonly) BOOL isIntegerNumber; @end @implementation NSDecimalNumber (IsIntegerNumber) -(BOOL)isIntegerNumber { NSDecimalValue value = [self decimalValue]; if (NSDecimalIsNotANumber(&value)) return NO; NSDecimal rounded; NSDecimalRound(&rounded, &value, 0, NSRoundPlain); return NSDecimalCompare(&rounded, &value) == NSOrderedSame; } @end yoninja Subtract the whole number from the decimal number. If the difference is zero then the decimal number is

I can't find any resources on this, and I've been trying all sorts of stuff, but nothing works. According to Apple's documentation, you round an NSDecimalNumber like this: NSDecimalNumber.decimalNumberByRoundingAccordingToBehavior(<#behavior: NSDecimalNumberBehaviors?#>) It takes in an NSDecimalNumberBehavior, which I'm unsure how to manipulate since it (1) cannot be initiated into a variable and have it's properties changed, and (2) the roundingMode() method according to the documentation doesn't take any parameters, but Xcode fills in a parameter space for "self". I'm totally lost on this.

I know float or double are not good for storing decimal number like money and quantity. I'm trying to use NSDecimalNumber instead. Here is my code in Swift playground. let number:NSDecimalNumber = 1.66 let text:String = String(describing: number) NSLog(text) The console output is 1.6599999999999995904 How can I store the exact value of the decimal number 1.66 in a variable? In let number:NSDecimalNumber = 1.66 the right-hand side is a floating point number which cannot represent the value "1.66" exactly. One option is to create the decimal number from a string: let number = NSDecimalNumber