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Objective-C Numbers

程序员文章站 2022-03-18 17:04:22
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 metho ......

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 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