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//Skyler LopezMaldonado
//CSCI1010
//Menu functions
//september 20 2013
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
// Function declarations, variables are passed by reference
void mostPowerful(double &, double &, double &, double &, int &);
void discountResults(double &, double &, double &, double &);
void howMany(double &, double &, int &, double &);
char menu(char);
int main() {
double power1; // Power measurement 1
double power2; // Power measurement 2
double power3; // Power measurement 3
double max = 0; // Maximum power measurement, initialized to zero
int num = 0; // Number representing which jetpack is the most powerful
double price; // Price variable
double discount; // Discount percentage
double discountAmount = 0; // Amount taken off as discount
double discountPrice = 0; // Final discounted price
double money; // Amount of money available
double cost; // Cost of item
int numAvail = 0; // Number of items that can be purchased
double moneyLeft = 0; // Money leftover from purchase
char choice = 'n';
char m = 'n',d = 'n',h = 'n',q = 'n';
// Each of these sections that ask for user input should be integrated into
// the menu function. A prototype for the menu function is provided above,
// but the function itself is nearly complete.
cout << "Welcome to Skyler Lopez's Space Travel Company" << endl;
cout << "(M)ost powerful Calculations'" << endl;
cout << "(D)isount calculations" << endl;
cout << "(H)ow many calculations" << endl;
cout << "(Q)uit" << endl;
cout << endl;
cout << "Please enter the option (M, D, H, or Q)";
cout << menu(choice); //needs to be initialized!!! doesn't want to work!
if (choice = m)
{
cout << "Please enter 3 power output measurements in MW: "<< endl;
cin >> power1;
cin >> power2;
cin >> power3;
mostPowerful(power1, power2, power3, max, num);
cout << "The largest power output is " << max << " and is Jetpack number is "
<< num << endl << endl;
}
else if (choice = d)
{
cout << "Please enter a price and a discount amount: ";
cin >> price;
cin >> discount;
discountResults(price, discount, discountAmount, discountPrice);
cout << "The discount amount is " << discountAmount
<< " and the discounted price is " << discountPrice << endl << endl;
}
else if (choice = h)
{
cout << "Please enter amount available and cost of each: ";
cin >> money;
cin >> cost;
howMany(money, cost, numAvail, moneyLeft);
cout << "You can buy " << numAvail << " and have "
<< moneyLeft << " left over." << endl << endl;
cin.get();
cin.get();
system ("PAUSE");
return 0;
}while (choice != q);
}
void mostPowerful(double &p1, double &p2, double &p3, double &max, int &num) {
// Comparison to determine the maximum power output and to set it to
// the max variable as well as setting the num variable based on the max
if ((p1 > p2) && (p1 > p3)) {
max = p1;
num = 1;
}
else if ((p2 > p1) && (p2 > p3)) {
max = p2;
num = 2;
}
else {
max = p3;
num = 3;
}
}
void discountResults(double &p, double &d, double &da, double &dp) {
// Discount amount equlas price times discount
da = p * d;
// Discount price equals price minus discount amount
dp = p  da;
}
void howMany(double &m, double &c, int &na, double &ml) {
// temp is a variable to hold the value of money divided by cost
double temp;
temp = m / c;
// The value stored in temp is cast to an integer to determine the
// number available to purchase
na = (int)temp;
// Money left is determined by subtracting the cost times number available
// to purchase from the amount of money available
ml = m  na * c;
}
char menu(char choice)
{
char decision;
decision = choice;
return decision;
}
