왜 내 코드가 출력됩니다 * 전무의 설명 *

LotteryEntry.h

#import <Foundation/Foundation.h> 

@interface LotteryEntry : NSObject 
{ 
    NSCalendarDate *entryDate; 
    int firstNumber; 
    int secondNumber; 
} 

- (void) prepareRandomNumbers; 
- (void) setEntryDate:(NSCalendarDate *)date; 
- (NSCalendarDate*)entryDate; 
- (int) firstNumber; 
- (int) secondNumber; 

@end

LotteryEntry.m

#import "LotteryEntry.h" 

@implementation LotteryEntry 

- (void) prepareRandomNumbers 
{ 
    firstNumber = random() % 100 + 1; 
    secondNumber = random() % 100 + 1; 
} 

- (void) setEntryDate:(NSCalendarDate *)date 
{ 
    entryDate = date; 
} 

- (NSCalendarDate *) entryDate 
{ 
    return entryDate; 
} 

- (int)firstNumber 
{ 
    return firstNumber; 
} 

- (int)secondNumber 
{ 
    return secondNumber; 
} 

- (NSString *)description 
{ 
    NSString *result; 
    result = [[NSString alloc] initWithFormat:@"%@ = %d and %d", 
       [entryDate descriptionWithCalendarFormat:@"%b %d %Y"], 
       firstNumber, secondNumber]; 
} 
@end

lottery.m

#import <Foundation/Foundation.h> 
#import "LotteryEntry.h"; 

int main (int argc, const char * argv[]) 
{   
    @autoreleasepool 
    {  
     //create the date object 
     NSCalendarDate *now = [[NSCalendarDate alloc] init]; 

     //see the random number generator 
     srandom(time(NULL)); 
     NSMutableArray *array; 
     array = [[NSMutableArray alloc] init]; 

     int i; 
     for(i = 0; i < 10; i++) 
     { 
      //create date time object that is i weeks from now 
      NSCalendarDate *iWeeksFromNow; 
      iWeeksFromNow = [now dateByAddingYears:0 
              months:0 
               days:(i * 7) 
              hours:0 
              minutes:0 
              seconds:0]; 

      //create a new isntand of lottery entry 
      LotteryEntry *newEntry = [[LotteryEntry alloc] init]; 
      [newEntry prepareRandomNumbers]; 
      [newEntry setEntryDate:iWeeksFromNow]; 

      //add the lottery entry object to the array 
      [array addObject:newEntry]; 

      /* 
      NSNumber *newNumber; 
      newNumber = [[NSNumber alloc] initWithInt:(i * 3)]; 
      //[array addObject:newNumber]; 

      @try 
      { 

       [array addObject:newNumber]; 
      } 
      @catch (NSException *exception) 
      { 
       NSLog(@"catched error: %@", exception.description); 
      } 
      */ 
     } 


     for (LotteryEntry *entryToPrint in array) 
     { 
      //display entry 
      NSLog(@"%@", entryToPrint); 
     } 


    } 
    return 0; 
}

출력 :

GNU gdb 6.3.50-20050815 (Apple version gdb-1708) (Mon Aug 8 20:32:45 UTC 2011) 
Copyright 2004 Free Software Foundation, Inc. 
GDB is free software, covered by the GNU General Public License, and you are 
welcome to change it and/or distribute copies of it under certain conditions. 
Type "show copying" to see the conditions. 
There is absolutely no warranty for GDB. Type "show warranty" for details. 
This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys000 
[Switching to process 898 thread 0x0] 
2011-11-08 11:16:21.193 lottery[898:707] *nil description* 
2011-11-08 11:16:21.196 lottery[898:707] *nil description* 
2011-11-08 11:16:21.198 lottery[898:707] *nil description* 
2011-11-08 11:16:21.199 lottery[898:707] *nil description* 
2011-11-08 11:16:21.200 lottery[898:707] *nil description* 
2011-11-08 11:16:21.201 lottery[898:707] *nil description* 
2011-11-08 11:16:21.202 lottery[898:707] *nil description* 
2011-11-08 11:16:21.204 lottery[898:707] *nil description* 
2011-11-08 11:16:21.205 lottery[898:707] *nil description* 
2011-11-08 11:16:21.206 lottery[898:707] *nil description* 
Program ended with exit code: 0

출처

2011-11-08 ian

-description 메서드는 실제로 아무것도 반환하지 않습니다. 컴파일러에서 경고하는 중입니다.

또한 ARC에서 실행중인 경우가 아니면 해당 방법으로 alloc/init이라는 문자열이 새어 나옵니다.

- (NSString *)description 
{ 
    return [NSString stringWithFormat:@"%@ = %d and %d", 
       [entryDate descriptionWithCalendarFormat:@"%b %d %Y"], 
       firstNumber, secondNumber]; 
}

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출처

2011-11-08 21:27:51

왜 내 코드가 출력됩니다 * 전무의 설명 *

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