private int recBSearch(int low,int high,int key){
		
		int curr=(low+high)/2;
		if(array[curr]==key)
			return curr;
		else if(low>high)
			return -1;
		else{
			if(key>array[curr])
				return recBSearch(curr+1,high,key);
			else
				return recBSearch(low,curr-1,key);
			
		}
	}