Objective-C Numbers

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In Objective-C programming language, in order to save the basic data types like int, float, bool in object form,

Objective-C provides a range of methods to work with NSNumber and important ones are listed in following table.

S.N.Method and Description
1+ (NSNumber *)numberWithBool:(BOOL)value
Creates and returns an NSNumber object containing a given value, treating it as a BOOL.
2+ (NSNumber *)numberWithChar:(char)value
Creates and returns an NSNumber object containing a given value, treating it as a signed char.
3+ (NSNumber *)numberWithDouble:(double)value
Creates and returns an NSNumber object containing a given value, treating it as a double.
4+ (NSNumber *)numberWithFloat:(float)value
Creates and returns an NSNumber object containing a given value, treating it as a float.
5+ (NSNumber *)numberWithInt:(int)value
Creates and returns an NSNumber object containing a given value, treating it as a signed int.
6+ (NSNumber *)numberWithInteger:(NSInteger)value
Creates and returns an NSNumber object containing a given value, treating it as an NSInteger.
7- (BOOL)boolValue
Returns the receiver's value as a BOOL.
8- (char)charValue
Returns the receiver's value as a char.
9- (double)doubleValue
Returns the receiver's value as a double.
10- (float)floatValue
Returns the receiver's value as a float.
11- (NSInteger)integerValue
Returns the receiver's value as an NSInteger.
12- (int)intValue
Returns the receiver's value as an int.
13- (NSString *)stringValue
Returns the receiver's value as a human-readable string.

Here is a simple example for using NSNumber which multiplies two numbers and returns the product.

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject

- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b;

@end

@implementation SampleClass

- (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b
{
   float number1 = [a floatValue];
   float number2 = [b floatValue];
   float product = number1 * number2;
   NSNumber *result = [NSNumber numberWithFloat:product];
   return result;
}

@end

int main()
{
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   SampleClass *sampleClass = [[SampleClass alloc]init];
   NSNumber *a = [NSNumber numberWithFloat:10.5];
   NSNumber *b = [NSNumber numberWithFloat:10.0];   
   NSNumber *result = [sampleClass multiplyA:a withB:b];
   NSString *resultString = [result stringValue];
   NSLog(@"The product is %@",resultString);

   [pool drain];
   return 0;
}

Now when we compile and run the program, we will get the following result.

2013-09-14 18:53:40.575 demo[16787] The product is 105


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