Sat. Oct 19th, 2019

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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