Creating shopping cart - c++

Question

for my class were creating a mini store, and I have the three main functions that work, main.cpp, items.cpp, items.h. but the shoppingcart.cpp and the shoppinfcart.h keeps giving me issues, because I'm trying to pass the parameters from main.cpp, for example (sc1.add(&a) to the functions in shoppingcart.h and shopping cart.cpp.
I have attached copy of my code. any help will be appreciated.
Item.h
#ifndef Items_hpp
#define Items_hpp
#include <string>
#include <iostream>
using namespace std;
class Items {
private:
string ItemName;
float ItemPrice;
int ItemQuant;
public:
Items();
Items(string in, float ip, int iq);
void Name(string in);
string entername();
void CalcPrice( float ip);
float enterprice();
void CalcQuant(int iq);
int enterquant();
};
#endif
Items.cpp
#include "Items.h"
Items::Items()
:ItemName("")
,ItemPrice(0)
,ItemQuant(0)
{
}
Items::Items(string in, float ip, int iq)
:ItemName(in)
,ItemPrice(ip)
,ItemQuant(iq)
{
}
void Items:: CalcPrice(float ip)
{
ItemPrice = ip;
}
void Items::CalcQuant(int iq)
{
ItemQuant = iq;
}
void Items:: Name(std::string in)
{
ItemName = in;
}
float Items:: enterprice()
{
return ItemPrice;
}
int Items:: enterquant()
{
return ItemQuant;
}
string Items:: entername()
{
return ItemName;
}
a snippet of the code for adding items to vector
ShoppingCart.cpp
#include "ShoppingCart.h"
#include <vector>
void ShoppingCart ::add(&its)
{
shopitems.push_back(&its);
}
ShoppingCart.h
#ifndef ShoppingCart_hpp
#define ShoppingCart_hpp
#include <iostream>
#include <string>
#include <vector>
#include "Items.h"
using namespace std;
class ShoppingCart
{
private:
vector <const char its> shopitems;
string cname; //customers name
string cdate; // todays date
public:
ShoppingCart();
ShoppingCart(string cname);
void add( char *its);
};
#endif
an example of main
main.cpp
#include <iostream>
#include <string>
#include <vector>
#include "Items.h"
#include "ShoppingCart.h"
using namespace std;
int main() {
char choice;
int itemsbuy;
float org = .75;
float appl = .25;
float pear = 1.00;
float bana = .85;
float grape = 6.00;
float oatmlk = 5.00;
float almmlk = 6.00;
float cashmlk= 5.00;
float soymlk = 4.00;
float cocomlk = 3.00;
float twopermlk = 3.00;
float vitdmlk = 4.00;
float fatmlk = 4.00;
float goatmlk = 6.00;
float rasinbran = 4.00;
float granola = 5.00;
float honeybunches = 6.00;
float twix = 4.00;
float honey = 5.00;
float yogurt = 1.50;
float cashyog = 2.00;
float eggs = 1.80;
float vegeggs = 3.00;
float cheese = 2.00;
float alcheese = 3.00;
int itemop;
int itemno;
int productcounter = 0;
int productsum= 0;//might need.
cout << "Welcome to J&S Breakfast Grocery store!"<<endl;
cout << "--------------------------------------"<<endl;
cout << "How many items will you be purchasing today?"<<endl;
cout << endl;
cin >> itemsbuy;
ShoppingCart sc1; //**intializing "shoppingcart.h"**//
for (int i = 0; i < itemsbuy; i++) {
cout << "Menu:"<<endl;
cout << "---------------------------"<<endl;
cout << "A. Fruits"<<endl;
cout << "B. Non-Diary"<<endl;
cout << "C. Diary" <<endl;
cout << "D. Cereal" <<endl;
cout << "E. Other"<<endl;
cout << "Please select your type of items to add to cart"<<endl;
cin >> choice;
cout << endl;
switch (choice) {
case 'A':
case 'a':
cout << "Menu:" <<endl;
cout << "---------------------------"<<endl;
cout << "1.Oranges -$ "<< org<<endl;
cout << "2.Apples -$ "<< appl << endl;
cout << "3.Pears - $"<<pear<<endl;
cout << "4.Bananas - $" << bana << endl;
cout << "5.Grapes - $" << grape << endl;
cout << endl;
cout << "Chooose option"<<endl;
cin >> itemop;
cout << "How Many?"<<endl;
cin >> itemno;
if (itemno > itemsbuy) {
cout << "Error, cannot add more than youre planning to buy. Please start over."<<endl;
break;
}
else {
if (itemop ==1) {
Items a("Oranges" , org, itemno);
productcounter++;
sc1.add(&a); //**trying to pass parameter here**//
if (productcounter == itemsbuy) {
cout<< "Error. You are attempting to buy more than you planned. Please Start over. Thank you."<<endl;
}
}

Answer 1

There are a few mistakes in your code.
ShoppingCart.h:
vector <const char its> shopitems;.
std::vector is declared in the following syntax:
std::vector<data type> variable name.
It looks like that you're trying to create a container of Items and store them. Therefore instead of vector<const char> shopitems, you should use:
vector<Items> shopitems instead.
also:
void add(char* its); is incorrect, since this method will be adding Items to your shopitems vector. Change it to: void add(const Items& its);
This will pass a const reference of object Items, meaning the method will not copy the entire class Items when it is called, and the object will not be modifiable.
ShoppingCart.cpp:
Let's also fix the syntax and semantic in your .cpp file, the correct now is:
void ShoppingCart::add(const Item& its)
{
shopitems.push_back(its); //& is not necessary here.
}
Main.cpp
Now, in your main file let's call the method correctly. sc1.add(&a);, the: & here is telling it to pass the memory address of where the object Items a is located. Let's correct this, and pass the object Items a normally, simply write: sc1.add(a);
Logic error
There is one final logic error I caught in your code, that is: if (productcounter == itemsbuy). If itemsbuy (The amount of items you want to buy today) is: 1. Then, productcounter is also 1 and you can't buy anything, this should be: if (productcounter > itemsbuy)