// *****************************************************************
// Author:	Zhixiang Chen
// Class:	CSCI/CMPE 1170, Spring 2009
// Lab 28:	Header file for Lab 28
// Date:	January 12, 2009
// Comment: The code here is meant to be revised.
// *****************************************************************

#include <iostream>
#include <cstring>
#include <string>
#include <vector> 

using namespace std; 

#ifndef		LAB_28_HEAD_H		
#define		LAB_28_HEAD_H


//this function reverse a char string via pointer operations
char * reverse(char * s )
{
	char *p, *q, tmp; 
	int n; 

	n=strlen(s);						//get the length of string s
	q = (n > 0)? s + n - 1 : s;			//see what this do?
										//p starts at the beginning and move to right
										//q starts at the end and move to left
	for (p = s; p < q; ++p, --q)
	{
		//swap the char pointed by p with the char pointed by q 
		tmp = *p;						
		*p = *q; 
		*q = tmp; 
	}
	
	return s; 
}

//define studentType structure
struct studentType 
{
	string firstName,					//firstnames for students
		   lastName;					//last names for students
	char   grade;						//letter grades
}; 

//swapOne takes two pointer type parameters 
void swapOne(int * x, int * y)
{
	//watch carefully how we do the swaping. Compare this with swapTwo
	int temp; 
	temp = *x;					
	*x = *y; 
	*y = temp; 
}

//swapTwo takes two reference type parameters 
void swapTwo(int & x, int & y)
{
	//watch carefully how we do the swaping. Compare this with swapOne
	int temp; 
	temp = x;					
	x = y; 
	y = temp; 
}
//swapOne takes two pointer type parameters 
void swapThree(int x, int y)
{
	//watch carefully how we do the swaping
	int temp; 
	temp = x;					
	x = y; 
	y = temp; 
}


#endif