for (classType variable in collectionObject )
{ 
  statements 
}

 1 #import <Foundation/Foundation.h>
 2 
 3 int main()
 4 {
 5    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 6    NSArray *array = [[NSArray alloc]
 7    initWithObjects:@"string1", @"string2",@"string3",nil];
 8    for(NSString *aString in array)
 9    {
10       NSLog(@"Value: %@",aString);
11    }
12    [pool drain];
13    return 0;
14 }

Value: string1
Value: string2
Value: string3

for (classType variable in [collectionObject reverseObjectEnumerator])
{
    statements
}

 1 #import <Foundation/Foundation.h>
 2 
 3 int main()
 4 {
 5    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
 6    NSArray *array = [[NSArray alloc] initWithObjects:@"string1","string2",@"string3",nil];
 7    for(NSString *aString in [array reverseObjectEnumerator])
 8    {
 9       NSLog(@"Value: %@",aString);
10    }
11    [pool drain];
12    return 0;
13 }

Value: string3
Value: string2
Value: string1