Question

2. Create a class called Invoice that a store might use to represent an invoice for an item sold at the store. An Invoice should include four data members—the ID for the item sold (type string), name of item (type string), item description (type string) and the price of the item (type int). Your class should have a constructor that initializes the four data members. A constructor that receives multiple arguments. Example: ClassName( TypeName1 parameterName1, TypeName2 parameterName2, ... ) Provide a set and a get function for each data member. SearchbyNameAndAdd(): Ask the user which item he/she wants to purchase, if the item is found in the list then store the price of the item in a temporary array or variable. This function will keep adding the amount of items being selected by the user. Once the user has selected all the item he/she needs exit from this function and display the total amount by using the function below: o A function named getTotalAmount () that displays the total amount/bill as an int value.

write it in C++

Answer 1

I have implemented the "Invoice" class which contains itemId, itemName, itemDesc, itemPrice and totalAmount which is static data member for calculating totalAmount of all the items that are purchased by user.

Program:-

#include<iostream>

using namespace std;


class Invoice{

private:
    // store item id
    string itemId;

    // store item name
    string itemName;

    // store item desc
    string itemDesc;

    // store item price
    double itemPrice;

    // create static variable for total amount
    static int totalAmount;

public:

    // default constructor
    Invoice(){
    }

    // constructor intialize data members (create Item)
    Invoice(string id, string name, string desc, double price){

        itemId = id;
        itemName = name;
        itemDesc = desc;
        itemPrice = price;
    }

    // get function for itemId
    string getItemId(){

        return itemId;
    }

    // set function for itemId
    void setItemId(string id){

        itemId = id;
    }


    // get function for itemName
    string getItemName(){

        return itemName;
    }

    // set function for itemName
    void setItemName(string name){

        itemName = name;
    }


    // get function for itemDesc
    string getItemDesc(){

        return itemDesc;
    }

    // set function for itemDesc
    void setItemDesc(string desc){

        itemDesc = desc;
    }

    // get function for itemId
    double getItemPrice(){

        return itemPrice;
    }

    // set function for itemId
    void setItemPrice(double price){

        itemPrice = price;
    }

    // This function continuously ask the user to purchase an Item
    static void searchByNameAndAdd(Invoice items[]){

        string ch = "";

        do{
            // calculate total Items
            //int totalItems = sizeof(items)/sizeof(items[0]);

            // print item name
            int i=0;
            cout<<"------- Item Store -------\n"<<endl;
            for(i=0; i<3; i++)
                cout<<(i+1)<<". "<<items[i].getItemName()<<endl;

            cout<<(i+1)<<". EXIT"<<endl;
            // get the item name from the user
            cout<<"\nWhich item you want to purchase(Enter item Name) : ";
            cin>>ch;

            bool flag = false;
            // search item name into the array
            for(int i=0; i<3; i++){
                if(ch == items[i].getItemName()){
                    Invoice::totalAmount += items[i].getItemPrice();
                    flag = true;
                }
            }

            if(!flag && ch!="EXIT")
                cout<<"\nNo Item in the store\nPlease select right Item\n";
            else if(ch!="EXIT"){
                cout<<"you purchased "<<ch<<endl<<endl;
            }

        }while(ch!="EXIT");

        // call getTotalAmount() function for displaying totalAmount
        getTotalAmount();
    }


    //This function print the totalAmount for the user
    static void getTotalAmount(){

        // display total amount
        cout<<"\nTotal Amount is : "<<Invoice::totalAmount<<endl;
    }

};

// initialize static data member
int Invoice::totalAmount=0;

int main(){

    // initialize totalItems
    int totalItem = 3;

    Invoice items[totalItem];

    // enter first item detail

    // set ItemId
    items[0].setItemId("ID1");

    // set ItemName
    items[0].setItemName("Item1");

    // set ItemDesc
    items[0].setItemDesc("ItemDescription1");

    // set ItemPrice
    items[0].setItemPrice(50);


    // enter second item detail

    // set ItemId
    items[1].setItemId("ID2");

    // set ItemName
    items[1].setItemName("Item2");

    // set ItemDesc
    items[1].setItemDesc("ItemDescription2");

    // set ItemPrice
    items[1].setItemPrice(70);



    // enter third item detail

    // set ItemId
    items[2].setItemId("ID3");

    // set ItemName
    items[2].setItemName("Item3");

    // set ItemDesc
    items[2].setItemDesc("ItemDescription3");

    // set ItemPrice
    items[2].setItemPrice(90);


    // call the searchByNameAndAdd() function
    Invoice::searchByNameAndAdd(items);

    return 0;

}

Output:-

I hope you will understand the above program.

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Thank you.