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Bool statement not working, PLEASE HELP!! PROJECT DUE 8/5/15

kromansa (12)
Hey guys i need help on my project. So everything runs smoothly until the user inputs a different answer other than the ones asked for (the choices are a-i). So if the user puts a different answer its suppose to runt he program again. I do not know what I am doing wrong.

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  #include <iostream>
#include <string>
#include <cctype >
using namespace std;

const float RUSSIAN_RUBLE = 31.16840f;
const float NORTH_KOREAN_WON = 135.00f;
const float CHINESE_YUAN = 6.83200f;
const float CANADIAN_DOLLAR = 1.1137f;
const float CUBAN_PESO = 1.00f;
const float ETHIOPIAN_BIRR = 9.09f;
const float EGYPTIAN_POUND = 5.6275f;
const float TUNISIAN_DINAR = 1.3585f;
const float THAI_BAHT = 34.40f;


float getDollarAmt();
void displayCurrencies();
char getCurrencySelection();
float calcExchangeAmt(char letter, float dollar);
void displayResults(float dollar, float sum, char letter);
bool isSelectionValid(char letter);

int main()
{
	float dollar;
	char letter;
	float sum;
	char answer = 'Y';
	while (toupper(answer) == 'Y')
	{
		dollar = getDollarAmt();
		displayCurrencies();
		letter = getCurrencySelection();
		calcExchangeAmt(letter, dollar);
		sum = calcExchangeAmt(letter, dollar);
		displayResults(dollar, sum, letter);

		cout << "\nDo you wish to continue (Y for yes - N for no): ";
		cin >> answer;
		system("cls");
	}
}
float getDollarAmt()
{
	float dollar;
	cout << "Please enter the total dollar amount to exchange: $";
	cin >> dollar;
	return dollar;
}
void displayCurrencies()
{
	cout << "Please select a target currenc y:" << endl << endl
		<< "A Russian Ruble" << endl
		<< "B North Korean Won" << endl
		<< "C Chinese Yuan" << endl
		<< "D Cuban Peso" << endl
		<< "E Ethiopian Birr" << endl
		<< "F Thai Baht" << endl
		<< "G Canadian Dollars" << endl
		<< "H Tunisian Dinar" << endl
		<< "I Egyptian Pound" << endl << endl;
}
char getCurrencySelection()
{
	char letter;
	bool letterValid = false;

	while (letterValid == false)
	{
		cout << "Please enter your selection: ";
		cin >> letter;

		letterValid = isSelectionValid(letter);
	}
	return letter;
}
bool isSelectionValid(char letter)
{
	if ((toupper(letter) >= 'A') && (toupper(letter) <= ' I'))
	{
		return true;
	}
	else
	{
		return false;
	}
}
float calcExchangeAmt(char letter, float dollar)
{
	float sum;
	switch (toupper(letter))
	{
	case 'A': sum = RUSSIAN_RUBLE * dollar;
		break;
	case 'B': sum = NORTH_KOREAN_WON * dollar;
		break;
	case 'C': sum = CHINESE_YUAN * dollar;
		break;
	case 'D': sum = CUBAN_PESO * dollar;
		break;
	case 'E': sum = ETHIOPIAN_BIRR * dollar;
		break;
	case 'F': sum = THAI_BAHT * dollar;
		break;
	case 'G': sum = CANADIAN_DOLLAR * dollar;
		break;
	case 'H': sum = TUNISIAN_DINAR * dollar;
		break;
	case ' I': sum = EGYPTIAN_POUND * dollar;
		break;
	}
	return sum;
}
void displayResults(float dollar, float sum, char letter)
{
	string word;
	string word2;
	string word3;
	switch (toupper(letter))
	{
	case 'A': word = "Russian";
		word2 = "Ruble";
		break;
	case 'B': word = "North";
		word2 = "Korean";
		word3 = "Won";
		break;
	case 'C': word = "Chinese";
		word2 = "Yuan";
		break;
	case 'D': word = "Cuban";
		word2 = "Peso";
		break;
	case 'E': word = "Ethiopian";
		word2 = "Birr";
		break;
	case 'F': word = " Thai";
		word2 = "Baht";
		break;
	case 'G': word = "Canadian";
		word2 = "Dollars";
		break;
	case 'H': word = "Tunisian";
		word2 = "Dinar";
		break;
	case ' I': word = "Egyptian";
		word2 = "Pound";
		break;
	}
	cout << "$" << dollar << " is " << sum << " " << word << " "
		<< word2 << " " << word3;
} // end of displayResults()
Hippogriff (727)
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