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; 

}