Objective-C Numbers

2018-02-07 20:21:16来源:cnblogs.com作者:xujinzhong人点击

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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.

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

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