How to compare elements in int array to a integer? - iphone

Question

I want to compare an array containing int values to a number
example [1,2,30,1,40,200,10,500] < 500 meaning if array contains elements less than 500.
How can i do dis?
Thank alot in advance
I did this bt it say invalid opernd:
if ([placeName count])
{
for (int i =0; i < [placeName count]; i++)
{
NSArray *sortedArray=[placeName sortedArrayUsingFunction:intSort context:NULL];
self.placeName = [NSMutableArray arrayWithArray:sortedArray];
NSMutableArray *tempArray = [sortedArray objectAtIndex:i];
NSDecimalNumber *Distance = [tempArray objectForKey:#"distance"];
NSMutableArray *intDistanse=[Distance intValue];
DLog(#"Distance%d", intDistanse);
NSMutableArray *intDistanse=[Distance intValue];
DLog(#"Distance%d", intDistanse);
for(int j = 0; j < [intDistanse count]; j++)
{
if ( intDistanse[j] < 500 ) //here its says error
{
DLog(#"success");
}
}
}
}

Answer 1

What kind of an array? NSArray or language array?
Easiest way is a loop. Without knowing the type of the array, this is pseudo code.
for(int i = 0; i < arrayCount; i++)
if ( array[i] < 500 )
.... got an element less than 500 ....
The code doesn't really make sense:
that code should be generating a ton of compiler warnings; every warning indicates a bug that should be fixed. Also, try "Build and Analyze".
you are sorting an array every time through the loop; waste of resources and doesn't make sense
everything being typed as NSMutableArray* doesn't make sense; do you really have an array of arrays of arrays?
... calling objectForKey: on anything but an NSDictionary doesn't work
intValue returns an (int), not an NSMutableArray*
if intDistance is an (int), then it should just be ( intDistance < 500 )
Overall, I would suggest you step back and review the Objective-C language guide and a bunch of working examples.

Answer 2

Typically, you loop over each element in the array, checking if each element is less than 500.
For example:
int i;
for (i=0; i < THE_SIZE_OF_THE_ARRAY; ++i)
{
if (array[i] < 500)
{
/* Do something */
}
}

Answer 3

If you want to see whether there is at least one item that matches your condition:
bool found = false;
for(int i = 0; i < sizeof(example)/sizeof(example[0]); ++i)
{
if(example[i] < 500)
{
found = true;
break;
}
}
And if you want to check whether all items match your condition:
bool found = true;
for(int i = 0; i < sizeof(example)/sizeof(example[0]); ++i)
{
if(example[i] >= 500)
{
found = false;
break;
}
}

Answer 4

Did find a solution to it type casting:
NSMutableArray *tempArray = [sortedArray objectAtIndex:i];
//DLog(#"sortedArray%#", sortedArray);8=
NSNumber *DistanceNum = [tempArray objectForKey:#"distance"];
NSLog(#"distance%#:::",DistanceNum);
NSInteger intDistance = (int)[DistanceNum floatValue];
if(intDistance<500)
{
NSLog(#"h:)");
NSString *notifications =#"Yes";
[[AppHelper mDataManager] setObject:notifications forKey:#"notifications"];
NSLog(#"notifications:%#",notifications);
RemindMeViewController *object = [[RemindMeViewController alloc] initWithNibName:#"RemindMeViewController" bundle:nil];
// RemindMeViewController *object=[[RemindMeViewController alloc]initWithNibName];
NSLog(#"notifications set");
[object scheduleNotification];
}

Answer 5

You can do this very easily by just implementing the observer to compare. Following is just an example to implement the custom observer to compare
#implementation NSArray (KVO)
- (void)addObserver:(NSObject *)observer toObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context
{
NSUInteger idx=[indexes firstIndex];
while(idx!=NSNotFound)
{
[[self objectAtIndex:idx] addObserver:observer
forKeyPath:keyPath
options:options
context:context];
idx=[indexes indexGreaterThanIndex:idx];
}
}
- (void)removeObserver:(NSObject *)observer fromObjectsAtIndexes:(NSIndexSet *)indexes forKeyPath:(NSString *)keyPath
{
NSUInteger idx=[indexes firstIndex];
while(idx!=NSNotFound)
{
[[self objectAtIndex:idx] removeObserver:observer
forKeyPath:keyPath];
idx=[indexes indexGreaterThanIndex:idx];
}
}
-(void)addObserver:(id)observer forKeyPath:(NSString*)keyPath options:(NSKeyValueObservingOptions)options context:(void*)context;
{
if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd])
NSRaiseException(NSInvalidArgumentException,self,_cmd,#"not supported for key path %# (observer was %#)", keyPath, observer);
else
[super addObserver:observer
forKeyPath:keyPath
options:options
context:context];
}
-(void)removeObserver:(id)observer forKeyPath:(NSString*)keyPath;
{
if([isa instanceMethodForSelector:_cmd]==[NSArray instanceMethodForSelector:_cmd])
NSRaiseException(NSInvalidArgumentException,self,_cmd,#"not supported for key path %# (observer was %#)", keyPath, observer);
else
[super removeObserver:observer
forKeyPath:keyPath];
}
#end