// Source: "Software Design ...", John A Robinson, Newnes, 2004, page 223.
int search(int x, int array[], int num_in_array)
	{
	int i;
	for (i = 0; i < num_in_array; i++)
		{
 	if (array[i] == x)
			return(i);
		}
	return(-1);
	}