NOT(!) in objective c

Question

for (int i=0 ; i<=[secondSplitArrayValue count]; i++)   
{    
  if (![[secondSplitArrayValue objectAtIndex:i] isEqualToString:@"NULL"] ||  
  ![[splitArrayValue objectAtIndex:i] isEqualToString:@"Error"]   
    {  
        [secondSplitArrayValue removeObjectAtIndex:i];  
    }  
}  

I am trying to remove value of array at particular index where string is NOT EQUAL (!=) to NULL or Error. But in debugging time object is removed where NULL and Error present but I want to remove object where Null and Error not present.

Answer 1

You're probably looking for this I think:

for (int i=0 ; i<=[secondSplitArrayValue count]; i++)   
{    
  if (!([[secondSplitArrayValue objectAtIndex:i] isEqualToString:@"NULL"] ||  
  [[splitArrayValue objectAtIndex:i] isEqualToString:@"Error"])   
    {  
        [secondSplitArrayValue removeObjectAtIndex:i];  
    }  
}  

This way you inverse the boolean operation only after you have completed the check for both cases, and the OR operation of both of the resulting checks.