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/* Attached: Currency Exchange Project, header file: prototypes.h
* =============================================================================
* File: Currency Exchange Project,
* =============================================================================
* Author: gears
* =============================================================================
* Description: Allows the user to enter an amount in U.S dollars. The program
* then presents a menu of foreign currencies from which to select an exchange.
* When the user makes a currency selection, the program displays the U.S dollar
* amount the user entered in the target currency.
* =============================================================================
* Created on May 13, 2014, 6:44 PM
*/
#include <cstdlib>
#include <iostream>
#include <string>
const float RUSSIAN_RUBLE = 31.168;
const float NORTH_KOREAN_WON = 135.00; /* variables which hold global constants */
const float CHINESE_YUAN = 6.832;
const float CANADIAN_DOLLAR = 1.1137;
const float CUBAN_PESO = 1.0;
const float ETHIOPIAN_BIRR = 9.09;
const float EGYPTIAN_POUND = 5.6275;
const float TUNISIAN_DINAR = 1.3585;
const float THAI_BAHT = 34.4;
float getDollarAmount();
void DisplayCurrencies();
char GetcurrencySelection();
bool IsSelectionValid( char test);
float CalcExchangeAmount (char selection, float DollarAmount);
void DisplayResults(float DollarAmount, float Exchange, string Nameofcountry);
using namespace std;
/* ==main=======================================================================
*
* =============================================================================
*/
int main(int argc, char** argv)
{
char selection;
float DollarAmount; // variables, it will hold values for the program
char choice;
float Exchange;
string Nameofcountry;
float Amount;
do
{ // clears the screen when the loop restarts
system ("cls");
// it is a function call and gets the results from dollar maount
DollarAmount = getDollarAmount();
// this is a function call, it displays the currencies for the user
DisplayCurrencies();
// function call, retrieves the selection from the user
choice = GetcurrencySelection();
// gets the user input and assigns the input to the variable "choice"
switch(toupper(choice))
{
case 'A': Nameofcountry = "Russian Rubles";
break;
case 'B': Nameofcountry = "North Korean Won";
break;
case 'C': Nameofcountry = "Chinese Yuan";
break;
case 'D': Nameofcountry = "Canadian Dollars";
break;
case 'E': Nameofcountry = "Cuban Pesos";
break;
case 'F': Nameofcountry = "Ethiopian Birr";
break;
case 'G': Nameofcountry = "Egyptian Pounds";
break;
case 'H': Nameofcountry = "Tunisian Dinars";
break;
case 'I': Nameofcountry = "Thai Baht";
break;
}
// Function call, the variable "Amount"
//accepts the calculation of "CalcExchangeAmount"
Amount = CalcExchangeAmount (choice, DollarAmount);
// function call, displays the results from each given variable
// in the arguement
DisplayResults(DollarAmount,Exchange,Nameofcountry);
cout << " would you like to restart and try again? (Y/N)"<< endl;
cin >> choice;
} while(toupper(choice)=='Y');
return 0;
}
//== getDollarAmoun ============================================================
// this function retrieves the users amount and it is then accepted into the
// variable amount. it is then returned back to main where the value is held in
// " DollarAmount"
//
//Precondition:
// Not available
//Post-condition:
// the value is returned to main and the variable "DollarAmount" then is
// responsible for holding that value.
//==============================================================================
float getDollarAmount()
{
float Amount;
cout << "enter the amount please to exchange";
cin >> Amount;
return Amount;
}// end of getDollarAmount()
//==============================================================================
//
void DisplayCurrencies()
{
cout << "choose one good sir or ma'am"<< endl;
cout << "A Russian Ruble\n";
cout << "B North Korean Won\n";
cout << "C Chinese Yuan\n";
cout << "D Cuban Peso\n";
cout << "E Ethiopian Birr\n";
cout << "F Thai Baht\n";
cout << "G Canadian Dollars\n";
cout << "H Tunisian Dinar\n";
cout << "I Egyptian Pound\n";
}
char GetcurrencySelection()
{
char selection;
cout << "enter your selection: ";
cin >> selection;
while(!(IsSelectionValid(selection)))
{
cout << "error please try again. Please make a selection";
cin >> selection;
}
return selection;
}
bool IsSelectionValid( char selection)
{
bool test;
if (toupper(test) >= 'A' && toupper (test) <= 'J')
{
test = true;
}
else {
test = false;
}
return test;
}
float CalcExchangeAmount (char choice, float DollarAmount)
{
float amount;
switch (toupper(choice))
{
case'A': amount = RUSSIAN_RUBLE * DollarAmount;
break;
case 'B': amount = NORTH_KOREAN_WON * DollarAmount;
break;
case 'C': amount = CHINESE_YUAN * DollarAmount;
break;
case 'D': amount = CANADIAN_DOLLAR * DollarAmount;
break;
case 'E': amount = CUBAN_PESO * DollarAmount;
break;
case 'F': amount = ETHIOPIAN_BIRR * DollarAmount;
break;
case 'G': amount = EGYPTIAN_POUND * DollarAmount;
break;
case 'H': amount = TUNISIAN_DINAR * DollarAmount;
break;
case 'I': amount = THAI_BAHT * DollarAmount;
}
return amount;
}
void DisplayResults(float DollarAmount, float Exchange,string Nameofcountry)
{
cout << "\n$ " << fixed << setprecision(2)<< DollarAmount
<< " is " << fixed << setprecision(2) << Exchange
<< " " << Nameofcountry << "." << endl;
}
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