Question

hi i want to display string combination on nslog like this format

abc
bca
acb
and so on 

but
my program show me it like this format
permutations =

 (
        (
        c,
        b,
        a
    ),
        (
        b,
        c,
        a
    ),
        (
        c,
        a,
        b
    ),
        (
        a,
        c,
        b
    ),
        (
        b,
        a,
        c
    ),
        (
        a,
        b,
        c
    )
)

this is the code i am using

NSArray *array = [NSArray arrayWithObjects:@"a",@"b",@"c",nil];

NSMutableArray *permutations = nil;

int i = 0;
for (i = 0; i < array.count ; i++){

    if (!permutations){
        permutations = [NSMutableArray array];
        for (NSString *character in array){
            [permutations addObject:[NSArray arrayWithObject:character]];


        }

    } else {

        //make copy of permutations array and clean og array
        NSMutableArray *aCopy = [permutations copy] ;
        [permutations removeAllObjects];

        for (NSString *character in array){

            //loop through the copy
            for (NSArray *oldArray in aCopy){

                //check if old string contains looping char..
                if ([oldArray containsObject:character] == NO){

                    //update array
                    NSMutableArray *newArray = [NSMutableArray arrayWithArray:oldArray];
                    [newArray addObject:character];

                    //add to permutations
                    [permutations addObject:newArray];

                }

            }
        }            
    }



}

NSLog(@"permutations = \n %@",permutations);
}

kindly tell me how i can display it in my require format

Answer 1

Try this way :

NSString *stringPermuted=[NSString new];
for (NSArray *array in permutations) {
    for (NSString *string in array) {
        stringPermuted=[stringPermuted stringByAppendingFormat:@"%@",string];
    }
    stringPermuted=[stringPermuted stringByAppendingFormat:@"\n"];
}

NSLog(@"permutations=\n%@",stringPermuted);

Another Way :

NSString *stringPermuted=[NSString new];
for (NSArray *array in permutations) {
    stringPermuted=[stringPermuted stringByAppendingFormat:@"%@\n",[array componentsJoinedByString:@""]];
}
NSLog(@"permutations=\n%@",stringPermuted);