比對字串型別的數字

	NSString *num1 = @"2.3";
	NSString *num2 = @"2.5";
	NSComparisonResult result = [num1 compare:num2 options:NSNumericSearch];
	NSLog(@"result %d", result);
	-> -1
	enum _NSComparisonResult {NSOrderedAscending = -1, NSOrderedSame, NSOrderedDescending};
	typedef NSInteger NSComparisonResult;

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