How to avoid rounding off the float value when called from sqlite

I am using the following statement to get a float value from table:

NSNumber *f = [NSNumber numberWithDouble:(double)sqlite3_column_double(statement, 0)];

The value in the database is 23.679999999 but I am getting 23.68. I tried numberWithFloat but i got the same result. Can anyone tell me how to get the value without rounding off?