// *****************************************************************
// Author:	Zhixiang Chen
// Class:	CSCI/CMPE 1170, Spring 2009
// Lab 23:	Header file for Lab 23
// Date:	January 12, 2009
// Comment: The code here is meant to be revised.
// *****************************************************************

#include <iostream>
#include <cstring>
#include <string>
#include <cstdlib>
#include <iomanip>

using namespace std; 

#ifndef		LAB_23_HEAD_H		
#define		LAB_23_HEAD_H



/***********************************************************************
 This function does linear search to see if the target vaule is in the
 list or not. If yes, it returns the position of the target in the list
 otherwise it returns -1.
 Note: count is an output paramter to record the number of comparisons
 during the search
 ***********************************************************************/
int binarySearch(const int list[], const int value, int & count, const int SIZE) 	
{
	//working vars
	int first =0,				//beginning of the search range
		last = SIZE-1,			//end of the search range; 
		middle,					//middle of the search range
		pos = -1;				//position for the target or -1 if not in the list
	bool found =false;			//flag for being found 

	//set initial value for count
	count = 0; 

	while (!found && first <=last) 
	{
		count++;					//count comparisons

		middle =(first + last)/2;	//middle range for binary division
		if(list[middle]==value)		//found
		{
			found = true; 
			pos = middle; 
		}
		else if (list[middle] > value)	//search the left half
			last = middle - 1;	
		else							//search the right half		
			first = middle + 1; 
	}

	return pos; 
}

/************************************************************************
 this function print all numbers in the list. 
 ************************************************************************/
void showList(const int list[], const int SIZE)
{
	cout<<"The list is ..... " <<endl; 
	for (int i=0; i<SIZE; i++)
	{
		cout<<setw(8)<<right<<list[i]; 
		if ((i+1)%10==0)
			cout<<endl; 
	}
	cout<<endl; 

}

#endif