Question

I am trying to save a long long number (received as a string) such as ‘80182916772147201’ into an NSNumber.

NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterBehaviorDefault];

[item setObject:[f numberFromString:@"80182916772147201"] forKey:@"theID"];
[f release];

When I NSLog this out, assuming the string was ‘80182916772147201’ I get:

NSLog(@"%lld", [[item objectForKey:@"theID"] longLongValue]); 

Returns: ‘80182916772147200’ – Note the rounded down final digit.

What am I doing wrong?

Answer 1

The problem is that NSNumberFormatter has decided to represent that number as a floating-point number. To force it to use integers only:

[f setAllowsFloats:NO];