Stuck

[ShaunTraveler]

How do you add new items to a vector in a header/implementation project? I'm working with headers and implementations. I'm doing a "grocery cart" assignment.

Here's the prompt for the item and the quantity. I need help adding this new
(string) to the vector in another file. It feels simple but I can't grasp.

Vector name: vector<GroceryItem> shoppingCart;
Item function: newItem(Grocery Item a); (header)

void Customer::newItem(GroceryItem a) // function to add new item to cart (implementation)
{
shoppingCart.push_back(a);
}

while ( response == "y" )
{
cout << "Which item will you purchase?" << endl;
cout << "White Rose Low Fat Yogurt (item code = 0)" << endl
"1.99" << endl << endl;

"Diamond Crystal Salt (item code = 1)" << endl;
".89" << endl << endl;

"Trend Detergent (item code = 2)" << endl;
"1.49" << endl << endl;

"Bumble Bee Tuna (item code = 3)" << endl;
"0.89" << endl << endl;

"Carmela Corned Beef (item code = 4)" << endl;
"2.99" << endl << endl;

"Goya Olive Oil (item code = 5)" << endl;
"4.99" << endl << endl;

"Friendly's Ice Cream (item code = 6)" << endl;
"2.99" << endl << endl;

"Bird's Eye Mixed Vegetable (item code = 7)" << endl;
"0.99" << endl << endl;

"Prego Pasta Sauce (item code = 8)" << endl;
"1.79" << endl << endl;

"Nabisco Chips Ahoy! (item code = 9)" << endl;
"1.99" << endl << endl;

cin >> item;

cout << "Quantity: ";
cin >> quantity;

switch(item)
{
case 0: itemString = "White Rose Low Fat Yogurt, 1.99";
break;
case 1: itemString = "Diamon Crystal Salt, .89";
break;
case 2: itemString = "Trend Detergent, 1.49";
break;
case 3: itemString = "Bumble Bee Tuna, .89";
break;
case 4: itemString = "Carmela Corned Beef, 2.99";
break;
case 5: itemString = "Goya Olive Oil, 4.99";
break;
case 6: itemString = "Friendly's Ice Cream, 2.99";
break;
case 7: itemString = "Bird's Eye Mixed Vegetables, .99";
break;
case 8: itemString = "Prego Pasta Sauce, 1.79";
break;
case 9: itemString = "Nabisco Chips Ahoy, 1.99";

default: itemString = "Invalid entry";
break;


total += quantity;

}

Again, any help is welcome.

[keskiverto]

Please, explain

cin >> val;
if(!c.add_purchase(val)) break;;

(And use code tags.)

[ShaunTraveler]

Disregard. The focus is adding the new string to the vector from int main.

Vector name:

vector<GroceryItem> shoppingCart;

Item function:

newItem(Grocery Item a); (header)

Function definition:

void Customer::newItem(GroceryItem a)// function to add new item to cart (implementation)
 {
 shoppingCart.push_back(a); 
 }

[keskiverto]

Disregard.

Negative.

That code fragment has object with name c. That object calls its member function add_purchase.

The implementation of newItem reveals that it is a member function of some type Customer. What you don't show is whether the shoppingCart is also a member variable of type Customer.

If you are supposed to use a member function of a type, then you should have an object of that type.

Furthermore, your code implies that you have type GroceryItem but you have told us nothing about it.

[ShaunTraveler]

Right then...I managed to get more of it done. Now my question is:

void Customer::receipt()
{
     cout << "------------------------------------------------------" << endl << endl;
     for(int i=0;i<shoppingCart.get_size();i++)
     {
             cout << left << setw(35) << shoppingCart[i].getItemName() << right << shoppingCart[i].getItemPrice() << endl;
     }
     
     cout << left << setw(35) << "Amount Due: " << right << get_unpaid_balance() << endl;
     cout << left << setw(35) << "Credit Available: " << right << get_credit_limit() - get_unpaid_balance() << endl;
}

How do I call this implementation file function in main?

[mutexe]

instantiate a Customer object and call receipt() on it.

Customer customer;
customer.receipt();

Assuming you've #include'd your "Customer.h" (or whatever you've called it).