Find the occurrence of a char in a string

occurrence.m

#import <objc/objc.h>
#import <objc/Object.h>
#import <Foundation/Foundation.h>
 
@implementation TestObj
int main()
{
	 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
	// your code goes here
	NSString *string1 = @"antoaravinth";
   NSString *string2 = @"test";
   NSString * alphabets = @"qwertyuioplkjhgfdsazxcvbnm";
 
	NSMutableDictionary *wordOccurence1 = [NSMutableDictionary dictionary];
	NSMutableDictionary *wordOccurence2 = [NSMutableDictionary dictionary];
 
    for (NSInteger charIdx=0; charIdx<alphabets.length; charIdx++)
    {
    	NSString *s = [NSString stringWithFormat:@"%c",[alphabets characterAtIndex:charIdx]];
    	NSUInteger numberOfOccurrences = [[string1 componentsSeparatedByString:s] count] - 1;
    	NSUInteger numberOfOccurrences2 = [[string2 componentsSeparatedByString:s] count] - 1;
 
    	if(numberOfOccurrences != 0)
    		[wordOccurence1 setObject:[NSString stringWithFormat:@"%d",numberOfOccurrences]  forKey:s];
 
    	if(numberOfOccurrences2 != 0)
			 [wordOccurence2 setObject:[NSString stringWithFormat:@"%d",numberOfOccurrences2]  forKey:s];		
 
    }
 
	[wordOccurence1 enumerateKeysAndObjectsUsingBlock:^(id key, id object, BOOL *stop) {
    	NSLog(@"%@ = %@", key, object);
	}];
 
    	NSLog(@"Dic is %@",wordOccurence1);
    	NSLog(@"Dic is %@",wordOccurence2);
 
    [pool drain];
	return 0;
}
@end