How to build the simple change maker for a vending machine? - c++

Question

On the menu deposits n,d, q, o,f are indicated which are indication for nickel dime quarter , one dollar and five dollar. I should also indicate "C" as in cancel option when the user hits c. But i couldn't make it work. My program still runs even the user hit c. I am confused on this point?
switch(DepositIndication) {
case 'n': {
PurchasedPrice=PurchasedPrice-0.05;
NumOfNickels=NumOfNickels+1;
}
break;
case 'd': {
PurchasedPrice=PurchasedPrice-0.10;
NumOfdimes=NumOfdimes+1;
}
break;
case 'q': {
PurchasedPrice=PurchasedPrice-0.25;
NumOfquarters=NumOfquarters+1;
}
break;
case 'o': {
PurchasedPrice=PurchasedPrice-1.00;
NumOfOnes=NumOfOnes+1;
}
break;
case 'f': {
PurchasedPrice=PurchasedPrice-5.00;
NumOfFives=NumOfFives+1;
}
break;
}

Answer 1

the condition c is missing and I Put the break into to brackets;
switch (DepositIndication) {
case 'n':
{
PurchasedPrice = PurchasedPrice - 0.05;
NumOfNickels = NumOfNickels + 1;
break;
}
case 'd':
{
PurchasedPrice = PurchasedPrice - 0.10;
NumOfdimes = NumOfdimes + 1;
break;
}
case 'q':
{
PurchasedPrice = PurchasedPrice - 0.25;
NumOfquarters = NumOfquarters + 1;
break;
}
case 'o':
{
PurchasedPrice = PurchasedPrice - 1.00;
NumOfOnes = NumOfOnes + 1;
break;
}
case 'f':
{
PurchasedPrice = PurchasedPrice - 5.00;
NumOfFives = NumOfFives + 1;
break;
}
case 'c':
}
//you can print cancellation messages in here
break;
}
default:
break;
}

Answer 2

I should also indicate "C" as in cancel option when the user hits c
Your current code works fine the only thing you are missing to make that work right now is a default case or a case where you specifically check if the user inputed C.
Example:
switch(DepositIndication) {
// All other cases ...
case 'c': {
// The user canceled the interaction
std::cout << "Interaction was canceled." << std::endl;
break;
}
// Default case to ensure that even,
// if the user hits any other key we still handle his interaction
default {
std::cout << "No fitting interactional behaviour found." << std::endl;
break;
}
}
If you want to ensure that the user can even input big lettered chars and the switch case will still work you can use std::tolower and cast it back to a char.
Make the User-Input lowercase:
// Make DepositIndication lowercase
DepositIndication = std::tolower(DepositIndication, std::locale());