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.
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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