// ********************************************************************
// Author:		Zhixiang Chen
// Class:		CSCI/CMPE 1170, Spring 2009
// Lab 14:		Simple functions, header files
// Date:		January 12, 2009
// Revised on:  06/26/2009 by sirisha surisetty
// Comment:		The code here is meant to be revised.
//
//---------------------------------------------------------------------
//
// This lab exercise is to practice simple function definitions 
// and callings, header file creation and inclusion.
// We practice four basic types of functions: void type without
// parameters; void type with parameters; value-returning type without
// parameters; and value returning type with parameters.
//
// Compile and run your program. When everything is fine,
// print your .cpp file and turn it to me or the TA.
// *********************************************************************

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

//include my own header file
#include "lab_14_head.h"

using namespace std; 

int main( )
{

	/***************************************************************
	Part A. Practice
	***************************************************************/

	//variable declaration
	int number1, number2, result;	//vars to store two int values
	int flag;						//for option selection

	//call showMenu() to show the menu
	showMenu(); 
	
	//get option
	cout<<" Enter your choice => "; 
	cin>>flag; 

	//four case selection using switch
	switch(flag)
	{
		case 1:						//call fun_1()
				cout<<" Calling fun_1() ......................... "<<endl; 
				fun_1(); 
				cout<<" End of calling fun_1()" <<endl;  
				break; 
		case 2:						//call fun_2()
				cout<<" Calling fun_2() ......................... "<<endl; 
				cout<<" we must pass two parameters to it         "<<endl; 
				//get two numbers
				cout<<"Enter two numbers ==> "; 
				cin>>number1>>number2; 
				//function calling
				fun_2(number1, number2);		//see parameter passing 
				cout<<" End of calling fun_2()" <<endl;  
				break; 
		case 3:						//call fun_3()
				cout<<" Calling fun_3() ......................... "<<endl; 
				cout<<" We shall receive the value returned       "<<endl;
				result = fun_3();				//see how we recieve the value
				cout<<" The sum is " << result <<endl; 
				cout<<" End of calling fun_3()" <<endl; 
				break; 
		case 4:						//call fun_4()
				cout<<" Calling fun_4() ......................... "<<endl; 
				cout<<" We must pass two parameters to it         "<<endl; 
				cout<<" We shal also receive the value returned   "<<endl; 
				//get two numbers
				cout<<"Enter two numbers ==> "; 
				cin>>number1>>number2; 
				//function calling
				result = fun_4(number1, number2); //see parameter passing and value receiving
				cout<<" The sum is " << result <<endl; 
				cout<<" End of calling fun_4()" <<endl; 
				break; 
		default:
				cout<<"You entered a wrong choice "<<endl; 
	}
	
	/*******************************************************************************
	 Part B. Exercise. This part is for you to complete.Re-do Part A. However, you
	 shall use four functions to get firstName, lastName and print the name. Pay
	 close attention to the difference between "void type" and "value-returning type" 
	 and the difference between "with parameters" and "without parameters".
	 *******************************************************************************/

	//well done and exit
	return 0; 
}