newbie Help Question

im triyng learn code xcode

got book beginning objective c programming - tutorials beginner
(http://www.amazon.com/gp/product/b006ogb8zk/ref=kinw_myk_ro_title) , has me starting out doing simple addition program. mac os console

code:

 #import <foundation/foundation.h>  int main (int argc, const char * argv[]) {          nsautoreleasepool * pool = [[nsautoreleasepool alloc] init ];         // insert code here...         //declare , intialize variables                           int firstnumber=2;         int secondnumber=3;         int totalsum=0;         firstnumber=firstnumber+1;         secondnumber=secondnumber+1;         totalsum=firstnumber+secondnumber;         nslog(@"%d",totalsum);         nslog(@"the program has terminated successfully.");          [pool drain];                           return 0;     } 

it returns error nsautoreleasepool unavailable.

know program attempting do. trying output result of 7 , program has terminated in console window.

ideal why resulting in error , how can fix it.

 

that looks old-style autorelease code. old book?

try doing this:

code:

 @autoreleasepool {          program          code goes here      }

 

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