Challenge 1 question

Objective-C Programming (2nd Edition) 17. NSArray
1

Here’s my solution:

[code]#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
@autoreleasepool {
NSMutableArray *groceryList = [NSMutableArray array];
[groceryList addObject:@“Dog food”];
[groceryList addObject:@“Milk”];
[groceryList addObject:@“Dog treats”];
NSLog(@"\n\nMy grocery list is:\n\n");
for (NSString *currentItem in groceryList) {
NSLog(@"\n\n%@\n\n", currentItem);
}
}
return 0;
}[/code]

Nothing too special, seemed like a fairly simple challenge.

What I was wondering about, though, is whether there’s any way to use a loop to output the list and have it match the output listed in the book (i.e., skipping the log information that NSLog() gives). I know the book just skips that output, but I’m a bit sad I can’t make my output look nice. I tried to use printf(), but it doesn’t seem to like instances of NSString. Anything to be done about this?

2

Just invoke the UTF8String method on currentItem which is just an instance of NSString. (You have to change the %@ descriptor to %s in the format string.)

NSLog (@"\n\n%s\n\n", [currentItem UTF8String]);
3

Knew it had to be something simple. Brilliant! many thanks.

4

[code]
#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

@autoreleasepool {
    NSString *bread = @"Loaf of bread";
    NSString *milk = @"Container of milk";
    NSString *butter = @"Stick of butter";
    
    NSMutableArray *groceryList = [NSMutableArray array];
    [groceryList addObject: bread];
    [groceryList addObject: milk];
    [groceryList addObject: butter];
    
    NSLog(@"My grocery list is:\n");
    for (NSString *groceryItem in groceryList) {
        NSLog(@"%s\n", [groceryItem UTF8String]);
    }
}
return 0;

}[/code]

The weird thing is that mine still shows the log information even thought I call UTF8String.