/******************************************************************
Name :                       
Date :
Homework # :  Homework #6 Problem #1
Source  :    
Action  :  Menu is displayed allows user to calculate
		   Miles per Gallon, Total minutes and seconds
		   and determine if number is a prime number or not

Notes  :
********************************************************************/
#include <iostream>
#include <stdlib.h>      // this header file requires the .h
using namespace std;

void DisplayMenu(void);
void FindMilesPerGallon(void);
void ConvertTotalSeconds(void);
void IsPrimeNumber(void);


void main()
{
  int Choice;

  system("cls");	// this clears the output screen

  DisplayMenu();
  cin >> Choice;
  while (Choice != 4)
    {
      switch (Choice)
        {
	      case 1: FindMilesPerGallon();
			      break;
		  case 2: ConvertTotalSeconds();
				  break;
		  case 3: IsPrimeNumber();
				  break;
		  default : cout << "Sorry illegal choice, Please try again\n\n";
        }
      DisplayMenu();
      cin >> Choice;
	 
    }
}

/*********************  DisplayMenu  ************************************
Action  :  This just displays the menu to the screen
Parameters  : none
returns     : nothing
***********************************************************************/
void DisplayMenu()
{
  cout << "\n\nDo you want to:\n";
  cout << "   1) Find miles per gallon\n";
  cout << "   2) Convert total seconds to minutes and seconds\n";
  cout << "   3) Determine if number is a prime number or not\n";
  cout << "   4) QUIT\n\n";
  cout << "   CHOICE --> ";
  
}

/********************  FindMilesPerGallon  ******************************
Action  : Ask user to input number of miles traveled and number of
          gallons used then display the miles per gallon obtained.
Parameters : none
returns    : nothing
------------------------------------------------------------------------*/
void FindMilesPerGallon(void)
{
  float Miles = 0, Gallons = 0, MPG;

  cout << "\n\nPlease enter the number of gallons used--> ";
  cin >> Gallons;
  cout << endl << endl;
  cout << "Please enter miles traveled--> ";
  cin >> Miles;
  cout << endl << endl;

  MPG = Miles / Gallons;

  cout << "Your MPG is--> " << MPG << endl << endl;

}

/******************** ConvertTotalSeconds *********************
Action  : Ask user to input a given total number of seconds and then
          displays the corresponding number of minutes and seconds
Parameters : none
returns    : nothing
-------------------------------------------------------------------------*/
void ConvertTotalSeconds (void)
{
	int Seconds, Minutes, TotalSeconds = 0;
	
	cout << "\n\nPlease enter total seconds to convert--> ";
	cin >> TotalSeconds;
	cout << endl << endl;

	Minutes = TotalSeconds / 60;
	Seconds = TotalSeconds % 60;

	cout << "There are " << Minutes << " minutes and " << Seconds << " seconds.";
	cout << endl << endl;
}

/*********************** IsPrimeNumber()****************************
Action  : Ask user to input positive integer and will determine if number
          is a prime number or not.
Parameters  : none
Returns     : nothing
-------------------------------------------------------------------*/

void IsPrimeNumber (void)
{
	int Num, i;
	
	cout << "\n\nPlease enter number to check if it's prime--> ";
	cin >> Num;
	cout << endl << endl;
	
	for (i = 2; i <= Num; ++i)
	{
		;
	}
		if (Num % i == 0)
		{
			cout << Num << " is not a prime number.\n\n";
		}
		else if (Num % i != 0)
		{
			cout << Num << " is a prime number.\n\n";
		}
		else
		{
			cout << "Error with input.\n\n";
		}
	
}

for (i = 2; i <= Num; ++i)
	{
		;
	}
		if (Num % i == 0)
		{
			cout << Num << " is not a prime number.\n\n";
		}
		else if (Num % i != 0)
		{
			cout << Num << " is a prime number.\n\n";
		}
		else
		{
			cout << "Error with input.\n\n";
		}

if (Num > 1)
{
for ( i=2 ;i < Num ;i++ )
  {
   if( Num % i ==0 ) //its not prime
    {
     cout <<"Not prime";
      return; //return to calling function
    } 
  }
//If you happen to reach here,then the number is surely prime.
 cout << "No:prime";
}