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.

Sr.No. Method & 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.

Live Demo
#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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