Objective-C Numbers

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.

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

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface SampleClass:NSObject
 4 
 5 - (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b;
 6 
 7 @end
 8 
 9 @implementation SampleClass
10 
11 - (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b
12 {
13    float number1 = [a floatValue];
14    float number2 = [b floatValue];
15    float product = number1 * number2;
16    NSNumber *result = [NSNumber numberWithFloat:product];
17    return result;
18 }
19 
20 @end
21 
22 int main()
23 {
24    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
25 
26    SampleClass *sampleClass = [[SampleClass alloc]init];
27    NSNumber *a = [NSNumber numberWithFloat:10.5];
28    NSNumber *b = [NSNumber numberWithFloat:10.0];   
29    NSNumber *result = [sampleClass multiplyA:a withB:b];
30    NSString *resultString = [result stringValue];
31    NSLog(@"The product is %@",resultString);
32 
33    [pool drain];
34    return 0;
35 }

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

 1 2013-09-14 18:53:40.575 demo[16787] The product is 105