void bubble_sort(int *array, int length)
{
	int i, j, tmp;

	for(i=0; i<length-1; i++){
		for(j=length-1; j>i; j--){
			if(*(array+j-1) > *(array+j)){
				tmp = *(array+j-1);
				*(array+j-1) = *(array+j);
				*(array+j) = tmp;
			}
	        }
	}
}