Objective-C Numbers, objective-cnumbers
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 specified er's value as a BOOL. |
8 |
-(Char) charValue Returns the specified er's value as a char. |
9 |
-(Double) doubleValue Returns the specified er's value as a double. |
10 |
-(Float) floatValue Returns the aggreger's value as a float. |
11 |
-(NSInteger) integerValue Returns the specified er's value as an NSInteger. |
12 |
-(Int) intValue Returns the specified er's value as an int. |
13 |
-(NSString *) stringValue Returns the specified er's value as a human-readable string. |
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 SampleClass10 11 - (NSNumber *)multiplyA:(NSNumber *)a withB:(NSNumber *)b12 {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 @end21 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 18:53:40. 575 demo [16787] The product is 105