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Soda Machine Invetory

dpdervish (1)
So this is what I have so far. But I need to able make the machine keep track of how many sodas/drinks are left, and then, if the user choses it, tell them it was sold out. I figure I could do the last part, but I'm having serious problems actually figure out how to get it to count down and keep track of the sodas. 

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#include<iostream>
#include<iomanip>
using namespace std;

char drinkSelect(char choice) {
	
	cout << "A: Coke           $1.25\n" << "B: Sprite         $1.25\n" << "C: Water          $0.75\n" 
		<< "D: Dr. Pepper     $1.25\n\n" << "Press 'E' to Exit\n" << endl;
	cin >> choice;
	choice = toupper(choice);

	return choice; 
}

bool validChoice(char validChoice) {

	bool valid;
	
	if (validChoice == 'A' || validChoice == 'B' || validChoice == 'C' || validChoice == 'D' || validChoice == 'E')
	{
		valid = true;
	}
	else
	{
		valid = false;
	}

	return valid;
}

int calculate(char choice) {
	double userCash;
	double change;
	double more;

	if (choice == 'A') {
		cout << "\nCoke chosen\n" << "Total $1.25\n" << "\nInsert Cash\n";
		cin >> userCash;
		while (userCash < 1.25) {
			cout << "\nInsufficent funds, retry.\n";
			more = 1.25 - userCash;
			cout << "You needed: " << more << " more\n";
			cin >> userCash;
		}
		change = userCash - 1.25;
		cout << "\nYour change is $" << change << endl;
		
	}

	else if (choice == 'B') {
		cout << "\nSprite chosen\n" << "Total $1.25\n" << "\nInsert Cash\n";
		cin >> userCash;
		while (userCash < 1.25) {
			cout << "\nInsufficent funds, retry.\n";
			more = 1.25 - userCash;
			cout << "You needed: " << more << " more\n";
			cin >> userCash;
		}
		change = userCash - 1.25;
		cout << "\nYour change is $" << change << endl;
	}

	else if (choice == 'C') {
		cout << "\nWater chosen\n" << "Total $0.75\n" << "\nInsert Cash\n";
		cin >> userCash;
		while (userCash < .75) {
			cout << "\nInsufficent funds, retry.\n";
			more = .75 - userCash;
			cout << "You needed: " << more << " more\n";
			cin >> userCash;
		}
		change = userCash - .75;
		cout << "\nYour change is $" << change << endl;
	}

	else if (choice == 'D') {
		cout << "\nDr. Pepper chosen\n" << "Total $1.25\n" << "\nInsert Cash\n";
		cin >> userCash;
		while (userCash < 1.25) {
			cout << "\nInsufficent funds, retry.\n";
			more = 1.25 - userCash;
			cout << "You needed: " << more << " more\n";
			cin >> userCash;
		}
		change = userCash - 1.25;
		cout << "\nYour change is $" << change << endl;
	}

	else {
		return 0;
	}
}




int main(){
	
char tempChoice = ' ';
char choice;
bool validity;

	choice = drinkSelect(tempChoice); //storing users choice as choice

	validity = validChoice(choice); // checking validity of choice
	
	calculate(choice);



	system("pause");
	
	return 0;
}
Last edited on
Thomas1965 (4571)
You need some variables to store the initial amount you have in the beginning - like
int num_cokes = 10
After you have sold one you decrement the variable. If the variable is 0 then you put out "Sold out"
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