CODEWITHSUNDEEP
objective-c
Brosef
Brosef

Reputation: 3095

Printing a string object from an NSMutableArray

I stored some strings in objects and added the objects to an NSMutableArray. Now I want to print the strings in each element of the array. Clearly, I'm doing something wrong. I'm going to back and review these basics, but I was hoping someone could explain how I can print the string instead of the what looks to be the element address. 

/** interface **/
@property (nonatomic, copy) NSString*myNumber;

-(void)setNumber: (NSString*) randomNumber;


/** implementation **/

@synthesize myNumber;

-(void) setNumber:(NSString *)randomNumber
{
    myNumber = randomNumber;    
} 

/**main**/

Fraction * aFrac = [[Fraction alloc] init];
[aFrac setNumber:@"5/6"];
Fraction * bFrac = [[Fraction alloc] init];
[bFrac setNumber:@"2/3"];

NSMutableArray * myArray = [[NSMutableArray alloc] init];
[myArray addObject:aFrac];
[myArray addObject:bFrac];

int i;
for(i = 0; i<2; ++i)
{
    id myArrayElement  = [myArray objectAtIndex:i];
    NSLog(@"%@", myArrayElement);
}

for(i = 0; i<2; ++i)
{
    NSLog(@"%@", myArray[i]);    
}

Both for loops print the same thing.

Upvotes: 0

Views: 1735

Answers (3)

RyanR
RyanR

Reputation: 7758

I'm guessing the Fraction type you created has a NSString property or method named number (to match the -setNumber: method), in which case you would use the following code to print it:

NSLog("%@", [myArrayElement number]);

Or, for the second loop:

NSLog("%@", [myArray[i] number]);

Upvotes: 1

Hussain Shabbir
Hussain Shabbir

Reputation: 15035

In your code both for loop meaning has same only, try below

 for(i = 0; i<2; ++i)
{
id myArrayElement  = [myArray objectAtIndex:i];
NSLog(@"%@", myArrayElement.number);
}

for(i = 0; i<2; ++i)
{
NSLog(@"%@", myArray[i].number);    
}

Now here two array value you are extracting [myArray objectAtIndex:i] which is equivalent to myArray[i]

Upvotes: 0

Callum Abele
Callum Abele

Reputation: 71

When you pass a custom object to NSLog you have to override the -(NSString)description method in that object.

So in your Fraction class if you simply override this function like so

- (NSString*)description
{
  return self.myNumber;
}

that should log out what you want.

I would probably think about renaming that property from number as you are storing a string.

Hope that helps

Upvotes: 2

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