Why doesn't this code produce the correct output? [closed]

Answer 1

Just a quick and dirty solution (didn't rename variable names and so on) for your function

-(void) expand_combinations: (NSString *) remaining_string arg2:(NSString *)s arg3:(int) remain_depth
{
    NSString *newString = [remaining_string stringByReplacingCharactersInRange:NSMakeRange(remain_depth, 1) withString:@""];
    // NSLog(newString);

    if(remain_depth==0)
    {
        printf("%s\n",[s UTF8String]);
        return;
    }
    [self expand_combinations:remaining_string arg2:s arg3:remain_depth - 1];
    return;
}

Output (I used NSLog)

2010-09-26 04:27:26.462 Untitled[5417:207] abc
2010-09-26 04:27:26.462 Untitled[5417:207] abd
2010-09-26 04:27:26.463 Untitled[5417:207] acd
2010-09-26 04:27:26.467 Untitled[5417:207] bcd