why NSNumber didn't show correct number

Sorry, my company mac is English version, so I have to speak English in CSDN even though I'm Chinese.
Here is my code.

A.h

 # import  


@ Interface A: NSObject {
NSNumber * i; 

} 
@ Property (retain) NSNumber * i; 

@ End 

 # import "A.h" 


@ Implementation A 
@ Synthesize i; 

- (Void) dealloc {
[I release]; 
[Super dealloc]; 
} 

 # import  
# Import "A.h" 

int main (int argc, const char * argv []) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 

A * a = [[A alloc] init]; 

NSNumber * i = [[NSNumber alloc] initWithInt: 123]; 

[A setI: i]; 

NSLog (@ "i is% d", [a i]); 
[Pool drain]; 
return 0; 
} 

I expected "i is 123" in console, but I only got "i is 109952". Why


Reply:
[A i] returns a NSNumber pointer, you use% d output is of course is an integer pointer.
For all NSObject objects, all with% @ output:
NSLog (@ "i is% @", [a i]);
Or you want to use% d, it will turn into a value of type int:
NSLog (@ "i is% d", [a i]. IntValue);