This subclass of NSNumber provides an object-oriented wrapper for performing base-10 arithmetic operations. Instances of NSDecimalNumber are created with a string such as "10.2e4" using decimalNumberWithString:, or by specifying the mantissa, exponent, and whether or not it is negative in the method decimalNumberWith-Mantissa:exponent:isNegative:.

Arithmetic operations are performed on two decimal number objects using methods such as decimalNumberByAdding:, decimalNumberByMultiplying:, and so forth. The value of the decimal number can be accessed as a double by sending a doubleValue message to the object.

@interface NSDecimalNumber : NSNumber
// Initializers
- (id)initWithDecimal:(NSDecimal)dcm;
- (id)initWithMantissa:(unsigned long long)mantissa exponent:(short)exponent isNegative:(BOOL)flag;
- (id)initWithString:(NSString *)numberValue;
- (id)initWithString:(NSString *)numberValue locale:(NSDictionary *)locale;
// Class Methods
+ (NSDecimalNumber *)decimalNumberWithDecimal:(NSDecimal)dcm;
+ (NSDecimalNumber *)decimalNumberWithMantissa:(unsigned long long)mantissa exponent:(short)exponent isNegative:(BOOL)flag;
+ (NSDecimalNumber *)decimalNumberWithString:(NSString *)numberValue;
+ (NSDecimalNumber *)decimalNumberWithString:(NSString *)numberValue locale:(NSDictionary *)locale;
+ (id <NSDecimalNumberBehaviors>)defaultBehavior;
+ (NSDecimalNumber *)maximumDecimalNumber;
+ (NSDecimalNumber *)minimumDecimalNumber;
+ (NSDecimalNumber *)notANumber;
+ (NSDecimalNumber *)one;
+ (void)setDefaultBehavior:(id <NSDecimalNumberBehaviors>)behavior;
+ (NSDecimalNumber *)zero;
// Instance Methods
- (NSComparisonResult)compare:(NSNumber *)decimalNumber;
- (NSDecimalNumber *)decimalNumberByAdding:(NSDecimalNumber *)decimalNumber;
- (NSDecimalNumber *)decimalNumberByAdding:(NSDecimalNumber *)decimalNumber withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberByDividingBy:(NSDecimalNumber *)decimalNumber;
- (NSDecimalNumber *)decimalNumberByDividingBy:(NSDecimalNumber *)decimalNumber withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberByMultiplyingBy:(NSDecimalNumber *)decimalNumber;
- (NSDecimalNumber *)decimalNumberByMultiplyingBy:(NSDecimalNumber *)decimalNumber withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberByMultiplyingByPowerOf10:(short)power;
- (NSDecimalNumber *)decimalNumberByMultiplyingByPowerOf10:(short)power withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberByRaisingToPower:(unsigned)power;
- (NSDecimalNumber *)decimalNumberByRaisingToPower:(unsigned)power
withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberByRoundingAccordingToBehavior: (id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimalNumber *)decimalNumberBySubtracting:(NSDecimalNumber *)decimalNumber;
- (NSDecimalNumber *)decimalNumberBySubtracting:(NSDecimalNumber *)decimalNumber withBehavior:(id <NSDecimalNumberBehaviors>)behavior;
- (NSDecimal)decimalValue;
- (NSString *)descriptionWithLocale:(NSDictionary *)locale;
- (double)doubleValue;
- (const char *)objCType;