NSNumber initWithDouble example objc

You can create an NSNumber object with double value by calling NSNumber  initWithDouble method. NSNumber is an general container object for any number(integer, float, double...). Note that NSNumber initWithDouble method begins with "init" as its method prefix, so the returned object is not auto-released. You should release the NSNumber object when you are done with the object. [NSNumber initWithDouble example]

#import <Foundation/Foundation.h>

int main(int argc, char *argv[])

{

NSAutoreleasePool *pool = [NSAutoreleasePool new];

NSNumber *objNum;

NSInteger n;

// create a NSNumber object with int value 100.

// it returns an autoreleased object. 

//

objNum = [NSNumber numberWithInt:100];

// Get the integer value from NSNumber.

//

n = [objNum integerValue];

NSLog(@"n:%i",n);


objNum = nil;

 


// allocate a number with Double value. not an autoreleased object.

//

objNum = [[NSNumber alloc]initWithDouble:0.7];

NSLog(@"number:%f", [objNum doubleValue]);

[objNum release];

[pool drain];

return 0; 

}

NSNumber integerValue example objc

You can extract the integer value from a NSNumber object by calling NSNumber:integerValue method. NSNumber is an general container object for any number(integer, float, double...). Note that NSNumber:integerValue method returns an integer value that is not an object but a native type value. NSInteger is just another name for 'int' type. [NSNumber:integerValue example]

Example>

#import <Foundation/Foundation.h>

int main(int argc, char *argv[])

{

NSAutoreleasePool *pool = [NSAutoreleasePool new];

NSNumber *objNum;

NSInteger n;

// create a NSNumber object with int value 100.

// it returns an autoreleased object. 

//

objNum = [NSNumber numberWithInt:100];

// Get the integer value from NSNumber.

//


n = [objNum integerValue];

NSLog(@"n:%i",n);


objNum = nil;

 


// allocate a number with Double value. not an autoreleased object.

//


objNum = [[NSNumber alloc]initWithDouble:0.7];

NSLog(@"number:%f", [objNum doubleValue]);

[objNum release];

[pool drain];

return 0; 

}

NSNumber numberWithInt example objc

You can create an NSNumber object with integer value by calling NSNumber numberWithInt method. NSNumber is an general container object for any number(integer, float, double...). Note that NSNumber numberWithInt method returns an autoreleased object. Unless the number is retained, it will go away after AutoReleasePool is drained. [NSNumber numberWithInt example]

#import <Foundation/Foundation.h>

int main(int argc, char *argv[])

{

NSAutoreleasePool *pool = [NSAutoreleasePool new];

NSNumber *objNum;

NSInteger n;

// create a NSNumber object with int value 100.

// it returns an autoreleased object. 

//

objNum = [NSNumber numberWithInt:100];

// Get the integer value from NSNumber.

//

n = [objNum integerValue];

NSLog(@"n:%i",n);


objNum = nil;

 


// allocate a number with Double value. not an autoreleased object.

//

objNum = [[NSNumber alloc]initWithDouble:0.7];

NSLog(@"number:%f", [objNum doubleValue]);

[objNum release];

[pool drain];

return 0; 

}