CODEWITHSUNDEEP
iosobjective-ccomparison
Fahim Parkar
Fahim Parkar

Reputation: 31647

comparision between nsmutablearray.count & tableview indexpath.row is giving odd results

I have below.

NSLog(@"aaaa===%ld==%ld", indexPath.row, (rowsOptionss.count-1));

if (indexPath.row>(rowsOptionss.count-1)) {
    NSLog(@"000===this is true");
} else {
    NSLog(@"000===this is false");
}

if (0>-1) {
    NSLog(@"001===this is true");
} else {
    NSLog(@"001===this is false");
}

This is giving me result as below.

2016-02-04 13:02:15.316 ClubsFans[7085:16944474] aaaa===0==-1
2016-02-04 13:02:15.316 ClubsFans[7085:16944474] 000===this is false
2016-02-04 13:02:15.316 ClubsFans[7085:16944474] 001===this is true

I was expected to say 

2016-02-04 13:02:15.316 ClubsFans[7085:16944474] aaaa===0==-1
2016-02-04 13:02:15.316 ClubsFans[7085:16944474] 000===this is true >> this should be true
2016-02-04 13:02:15.316 ClubsFans[7085:16944474] 001===this is true

Any idea why this is going wrong?

Upvotes: 1

Views: 117

Answers (2)

Ketan P
Ketan P

Reputation: 4379

@Fahim Parkar

Please try to convert from NSInteger to Int. It might cause of comparing NSInteger.

if((int) indexPath.row > (int)(rowsOptionss.count-1))

Hope this will help you.

Upvotes: 0

meronix
meronix

Reputation: 6176

this may help you to understand:

NSIndexPath* indexPath = nil;
NSArray * rowsOptionss = [NSArray array];
NSLog(@"aaaa===%ld==%ld", indexPath.row, (rowsOptionss.count-1));
NSLog(@"real value: bbbb===%ld==%u", (long)indexPath.row, (rowsOptionss.count-1));

if (indexPath.row>(rowsOptionss.count-1)) {
    NSLog(@"000===this is true");
} else {
    NSLog(@"000===this is false");
}

if (0>-1) {
    NSLog(@"001===this is true");
} else {
    NSLog(@"001===this is false");
}

rowsOptionss.count is unsigned (NSUInteger) and if you do a -1 operation you'll get a very big positive number, that is always bigger than 0.

that's the log:

 aaaa===0==-1
 real value: bbbb===0==4294967295
 000===this is false
 001===this is true

if you need a signed int, use this instead:

NSInteger tempInt = rowsOptionss.count;
tempInt --;
LOG(@"tempInt %i", tempInt);

Upvotes: 5

Related Questions