NSNumber by example

Creating an NSNumber Object

+ numberWithBool:

Creates and returns an NSNumber object containing a given value, treating it as a BOOL.

Example

NSNumber *number = [NSNumber numberWithBool:YES];
NSLog(@"%@",number);

Output

2014-04-16 04:54:14.652 iOS-Tutorial[562:a0b] 1

+ numberWithChar:

Creates and returns an NSNumber object containing a given value, treating it as a signed char.

Example

NSNumber *number = [NSNumber numberWithChar:'t'];
NSLog(@"%@",number);

Output

2014-04-16 04:55:22.045 iOS-Tutorial[577:a0b] 116

+ numberWithDouble:

Creates and returns an NSNumber object containing a given value, treating it as a double.

Example

NSNumber *number = [NSNumber numberWithDouble:20.89];
NSLog(@"%@",number);

Output

2014-04-16 04:55:53.473 iOS-Tutorial[590:a0b] 20.89

+ numberWithFloat:

Creates and returns an NSNumber object containing a given value, treating it as a float.

Example

NSNumber *number = [NSNumber numberWithFloat:20.89];
NSLog(@"%@",number);

Output

2014-04-16 04:56:25.757 iOS-Tutorial[602:a0b] 20.89

+ numberWithInt:

Creates and returns an NSNumber object containing a given value, treating it as a signed int.

Example

NSNumber *number = [NSNumber numberWithInt:20];
NSLog(@"%@",number);

Output

2014-04-16 04:56:56.020 iOS-Tutorial[614:a0b] 20

+ numberWithInteger:

Creates and returns an NSNumber object containing a given value, treating it as an NSInteger.

Example

NSNumber *number = [NSNumber numberWithInteger:20];
NSLog(@"%@",number);

Output

2014-04-16 04:57:23.211 iOS-Tutorial[626:a0b] 20

+ numberWithLong:

Creates and returns an NSNumber object containing a given value, treating it as a signed long.

Example

NSNumber *number = [NSNumber numberWithLong:20];
NSLog(@"%@",number);

Output

2014-04-16 04:57:52.890 iOS-Tutorial[638:a0b] 20

+ numberWithLongLong:

Creates and returns an NSNumber object containing a given value, treating it as a signed long long.

Example

NSNumber *number = [NSNumber numberWithLongLong:20];
NSLog(@"%@",number);

Output

2014-04-16 04:58:18.213 iOS-Tutorial[652:a0b] 20

+ numberWithShort:

Creates and returns an NSNumber object containing value, treating it as a signed short.

Example

NSNumber *number = [NSNumber numberWithShort:20];
NSLog(@"%@",number);

Output

2014-04-16 04:58:38.256 iOS-Tutorial[664:a0b] 20

+ numberWithUnsignedChar:

Creates and returns an NSNumber object containing a given value, treating it as an unsigned char.

Example

NSNumber *number = [NSNumber numberWithUnsignedChar:'a'];
NSLog(@"%@",number);

Output

2014-04-16 04:59:19.390 iOS-Tutorial[678:a0b] 97

+ numberWithUnsignedInt:

Creates and returns an NSNumber object containing a given value, treating it as an unsigned int.

Example

NSNumber *number = [NSNumber numberWithUnsignedInt:23];
NSLog(@"%@",number];

Output

2014-04-16 05:00:54.791 iOS-Tutorial[695:a0b] 23

+ numberWithUnsignedInteger:

Creates and returns an NSNumber object containing a given value, treating it as an NSUInteger.

Example

NSNumber *number = [NSNumber numberWithUnsignedInteger:23];
NSLog(@"%@",number);

Output

2014-04-16 05:01:26.508 iOS-Tutorial[708:a0b] 23

+ numberWithUnsignedLong:

Creates and returns an NSNumber object containing a given value, treating it as an unsigned long.

Example

NSNumber *number = [NSNumber numberWithUnsignedLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:01:54.248 iOS-Tutorial[720:a0b] 23

+ numberWithUnsignedLongLong:

Creates and returns an NSNumber object containing a given value, treating it as an unsigned long long.

Example

NSNumber *number = [NSNumber numberWithUnsignedLongLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:02:17.541 iOS-Tutorial[732:a0b] 23

+ numberWithUnsignedShort:

Creates and returns an NSNumber object containing a given value, treating it as an unsigned short.

Example

NSNumber *number = [NSNumber numberWithUnsignedShort:23];
NSLog(@"%@",number);

Output

2014-04-16 05:02:44.967 iOS-Tutorial[744:a0b] 23

Initializing an NSNumber Object

- initWithBool:

Returns an NSNumber object initialized to contain a given value, treated as a BOOL.

Example

NSNumber *number = [[NSNumber alloc]initWithBool:23];
NSLog(@"%@",number);

Output

2014-04-16 05:03:45.192 iOS-Tutorial[759:a0b] 1

- initWithChar:

Returns an NSNumber object initialized to contain a given value, treated as a signed char.

Example

NSNumber *number = [[NSNumber alloc]initWithChar:'a'];
NSLog(@"%@",number);

Output

2014-04-16 05:04:20.052 iOS-Tutorial[771:a0b] 97

- initWithDouble:

Returns an NSNumber object initialized to contain value, treated as a double.

Example

NSNumber *number = [[NSNumber alloc]initWithDouble:23.87];
NSLog(@"%@",number);

Output

2014-04-16 05:04:54.547 iOS-Tutorial[785:a0b] 23.87

- initWithFloat:

Returns an NSNumber object initialized to contain a given value, treated as a float.

Example

NSNumber *number = [[NSNumber alloc]initWithFloat:23.87];
NSLog(@"%@",number);

Output

2014-04-16 05:05:19.591 iOS-Tutorial[797:a0b] 23.87

- initWithInt:

Returns an NSNumber object initialized to contain a given value, treated as a signed int.

Example

NSNumber *number = [[NSNumber alloc]initWithInt:23];
NSLog(@"%@",number);

Output

2014-04-16 05:05:47.535 iOS-Tutorial[809:a0b] 23

- initWithInteger:

Returns an NSNumber object initialized to contain a given value, treated as an NSInteger.

Example

NSNumber *number = [[NSNumber alloc]initWithInteger:23];
NSLog(@"%@",number);

Output

2014-04-16 05:06:10.067 iOS-Tutorial[821:a0b] 23

- initWithLong:

Returns an NSNumber object initialized to contain a given value, treated as a signed long.

Example

NSNumber *number = [[NSNumber alloc]initWithLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:06:38.763 iOS-Tutorial[833:a0b] 23

- initWithLongLong:

Returns an NSNumber object initialized to contain value, treated as a signed long long.

Example

NSNumber *number = [[NSNumber alloc]initWithLongLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:07:51.488 iOS-Tutorial[848:a0b] 23

- initWithShort:

Returns an NSNumber object initialized to contain a given value, treated as a signed short.

Example

NSNumber *number = [[NSNumber alloc]initWithShort:23];
NSLog(@"%@",number);

Output

2014-04-16 05:08:17.614 iOS-Tutorial[860:a0b] 23

- initWithUnsignedChar:

Returns an NSNumber object initialized to contain a given value, treated as an unsigned char.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedChar:'a'];
NSLog(@"%@",number);

Output

2014-04-16 05:08:47.289 iOS-Tutorial[872:a0b] 97

- initWithUnsignedInt:

Returns an NSNumber object initialized to contain a given value, treated as an unsigned int.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedInt:23];
NSLog(@"%@",number);

Output

2014-04-16 05:09:18.065 iOS-Tutorial[884:a0b] 23

- initWithUnsignedInteger:

Returns an NSNumber object initialized to contain a given value, treated as an NSUInteger.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedInteger:23];
NSLog(@"%@",number);

Output

2014-04-16 05:09:41.609 iOS-Tutorial[896:a0b] 23

- initWithUnsignedLong:

Returns an NSNumber object initialized to contain a given value, treated as an unsigned long.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:10:09.807 iOS-Tutorial[908:a0b] 23

- initWithUnsignedLongLong:

Returns an NSNumber object initialized to contain a given value, treated as an unsigned long long.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedLongLong:23];
NSLog(@"%@",number);

Output

2014-04-16 05:10:37.393 iOS-Tutorial[920:a0b] 23

- initWithUnsignedShort:

Returns an NSNumber object initialized to contain a given value, treated as an unsigned short.

Example

NSNumber *number = [[NSNumber alloc]initWithUnsignedShort:23];
NSLog(@"%@",number);

Output

2014-04-16 05:10:37.393 iOS-Tutorial[920:a0b] 23

Accessing Numeric Values

- boolValue

Returns the receivers value as a BOOL.

Example

NSNumber *number = [NSNumber numberWithBool:YES];
NSLog(@"%d",[number boolValue]);

Output

2014-04-16 05:11:59.626 iOS-Tutorial[936:a0b] 1

- charValue

Returns the receivers value as a char.

Example

NSNumber *number = [NSNumber numberWithChar:'A'];
NSLog(@"%c",[number charValue]);

Output

2014-04-16 05:12:59.850 iOS-Tutorial[969:a0b] A

- decimalValue

Returns the receivers value, expressed as an NSDecimal structure.

Example

NSNumber *number = [NSNumber numberWithDouble:10.2323];
NSLog(@"%d %d %d %d %d %d",[number decimalValue]._exponent,[number decimalValue]._isCompact,[number decimalValue]._isNegative,[number decimalValue]._length,[number decimalValue]._reserved,[number decimalValue]._mantissa[0]);

Output

2014-04-16 05:17:25.052 iOS-Tutorial[1000:a0b] -4 1 0 2 0 36787

- doubleValue

Returns the receivers value as a double.

Example

NSNumber *number = [NSNumber numberWithDouble:10.2323];
NSLog(@"%f",[number doubleValue]);

Output

2014-04-16 05:18:32.673 iOS-Tutorial[1021:a0b] 10.232300

- floatValue

Returns the receivers value as a float.

Example

NSNumber *number = [NSNumber numberWithDouble:10.2323];
NSLog(@"%f",[number floatValue]);

Output

2014-04-16 05:18:56.488 iOS-Tutorial[1033:a0b] 10.232300

- intValue

Returns the receivers value as an int.

Example

NSNumber *number = [NSNumber numberWithInteger:12];
NSLog(@"%d",[number intValue]);

Output

2014-04-16 05:19:50.368 iOS-Tutorial[1045:a0b] 12

- integerValue

Returns the receivers value as an NSInteger.

Example

NSNumber *number = [NSNumber numberWithInteger:12];
NSLog(@"%d",[number integerValue]);

Output

2014-04-16 05:20:20.704 iOS-Tutorial[1057:a0b] 12

- longLongValue

Returns the receivers value as a long long.

Example

NSNumber *number = [NSNumber numberWithLongLong:12];
NSLog(@"%lld",[number longLongValue]);

Output

2014-04-16 05:21:19.141 iOS-Tutorial[1069:a0b] 12

- longValue

Returns the receivers value as a long.

Example

NSNumber *number = [NSNumber numberWithLong:12];
NSLog(@"%ld",[number longValue]);

Output

2014-04-16 05:21:53.138 iOS-Tutorial[1082:a0b] 12

- shortValue

Returns the receivers value as a short.

Example

NSNumber *number = [NSNumber numberWithShort:12];
NSLog(@"%d",[number shortValue]);

Output

2014-04-16 05:22:24.625 iOS-Tutorial[1094:a0b] 12

- unsignedCharValue

Returns the receivers value as an unsigned char.

Example

NSNumber *number = [NSNumber numberWithUnsignedChar:'a'];
NSLog(@"%c",[number unsignedCharValue]);

Output

2014-04-16 05:23:35.698 iOS-Tutorial[1108:a0b] a

- unsignedIntegerValue

Returns the receivers value as an NSUInteger.

Example

NSNumber *number = [NSNumber numberWithUnsignedInteger:12];
NSLog(@"%d",[number unsignedIntegerValue]);

Output

2014-04-16 05:24:38.770 iOS-Tutorial[1123:a0b] 12

- unsignedIntValue

Returns the receivers value as an unsigned int.

Example

NSNumber *number = [NSNumber numberWithUnsignedInteger:12];
NSLog(@"%d",[number unsignedIntValue]);

Output

2014-04-16 05:25:02.346 iOS-Tutorial[1136:a0b] 12

- unsignedLongLongValue

Returns the receivers value as an unsigned long long.

Example

NSNumber *number = [NSNumber numberWithUnsignedLongLong:12];
NSLog(@"%llu",[number unsignedLongLongValue]);

Output

2014-04-16 05:25:39.445 iOS-Tutorial[1148:a0b] 12

- unsignedLongValue

Returns the receivers value as an unsigned long.

Example

NSNumber *number = [NSNumber numberWithUnsignedLong:12];
NSLog(@"%lu",[number unsignedLongValue]);

Output

2014-04-16 05:26:11.371 iOS-Tutorial[1160:a0b] 12

- unsignedShortValue

Returns the receivers value as an unsigned short.

Example

NSNumber *number = [NSNumber numberWithUnsignedShort:12];
NSLog(@"%u",[number unsignedShortValue]);

Output

2014-04-16 05:26:56.966 iOS-Tutorial[1172:a0b] 12

Retrieving String Representations

- descriptionWithLocale:

Returns a string that represents the contents of the receiver for a given locale.

Example

NSNumber *number = [NSNumber numberWithUnsignedShort:12];
NSLog(@"%@",[number descriptionWithLocale:[NSLocale localeWithLocaleIdentifier:@"en_US"]]);

Output

2014-04-16 05:28:39.951 iOS-Tutorial[1186:a0b] 12

- stringValue

Returns the receivers value as a human-readable string.

Example

NSNumber *number = [NSNumber numberWithUnsignedShort:12];
NSLog(@"%@",[number stringValue]);

Output

2014-04-16 05:29:11.144 iOS-Tutorial[1199:a0b] 12

Comparing NSNumber Objects

- compare:

Returns an NSComparisonResult value that indicates whether the receiver is greater than, equal to, or less than a given number.

Example

NSNumber *number1 = [NSNumber numberWithUnsignedShort:12];
NSNumber *number2 = [NSNumber numberWithFloat:12.3434];
NSComparisonResult result = [number2 compare:number1];
NSLog(@"%d",result);

Output

2014-04-16 05:30:30.629 iOS-Tutorial[1214:a0b] 1

- isEqualToNumber:

Returns a Boolean value that indicates whether the receiver and a given number are equal.

Example

NSNumber *number1 = [NSNumber numberWithUnsignedShort:12];
NSNumber *number2 = [NSNumber numberWithFloat:12.3434];
NSComparisonResult result = [number2 isEqualToNumber:number1];
NSLog(@"%d",result);

Output

2014-04-16 05:31:03.955 iOS-Tutorial[1227:a0b] 0

Accessing Type Information

- objCType

Returns a C string containing the Objective-C type of the data contained in the receiver.

Example

NSNumber *number = [NSNumber numberWithUnsignedShort:12];
NSLog(@"%s",[number objCType])

Output

2014-04-16 05:31:41.950 iOS-Tutorial[1239:a0b] i

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