How to implement for loop in objective c

Question

I am using Xcode 5 , I write this method but unfortunately this error appear: USE OF UNDECLARED IDENTIFIER otherCard. Although I declare it in the for loop:

- (void)chooseCardAtIndex:(NSUInteger)index{
    card *card =[self cardAtIndex:index];
    if(card.isMatched){
        if(card.isChosen){
            card.chosen =NO;

        }else {
            for(card *otherCard in self.cards){
                if(otherCard.isChosen && !otherCard.isMatched){
                    int matchScore =[card match:@[otherCard]];
                    if(matchScore){
                        self.score +=matchScore;
                    } else {
                        self.score -= MISMATCH_PENALTY;
                    }

                }
            }

        }
    }

}

thank you in advance

Can you post some more details? At what line compiler is throwing an error. — gagarwal
– gagarwal, Commented Mar 29, 2014 at 3:08
tow lines 1. int matchScore =[card match:@[otherCard]] 2.if(otherCard.isChosen && !otherCard.isMatched) — user3474825
– user3474825, Commented Mar 29, 2014 at 3:10
Using a lower cased class name is poor. Using the same name as an instance name is poorer. — matt
– matt, Commented Mar 29, 2014 at 3:16

Dave Wood · Accepted Answer · 2014-03-29 03:16:18Z

2

This line may be throwing off the compiler:

card *card =[self cardAtIndex:index];

Is card the class type or the variable name? It can't be both.

answered Mar 29, 2014 at 3:16

Dave Wood

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2 Comments

user3474825 Over a year ago

yes that right, now it is working, thank you , so it is not allowed to declare instance with same class name

Dave Wood Over a year ago

Correct. As others have added below, you want to stick to the convention of naming all classes with two or three capital letters. That makes it clear to you (and others who may read your code later), which is a class and which is a variable. Good luck!

Hot Licks · Accepted Answer · 2014-03-29 03:18:32Z

1

The problem is that when you defined variable card to be of class card earlier you hid the definition of class card. (A good reason to use the standard naming convention where class names always start with an Upper Case character.)

answered Mar 29, 2014 at 3:18

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