I cant figure out what should i do so that in case one, if i choose to continue buying, not to start from the begining, but just to do the remaining calculations. also if it is possible to help me with a function outside main so that i calculate the purchase and money left and call them in each case.. thanks a lot

#include <iostream.h>
#include <conio.h>


using namespace std;



int main()
{
    int prices[8];
    prices[0]=13.55;
    prices[1]=0.35;
    prices[2]=0.30;
    prices[3]=0.25;
    prices[4]=1.25;
    prices[5]=12.45;
    prices[6]=1.05;
    prices[7]=2.00;
    prices[8]=13.15;
    int money;
    int choice;
    int x;
    int calc;
    int y;
    int spent;
    cout<< "**Welcome to the buying machine**\n\n"<<endl;
    cout<<"Enter amount of money you have"<<endl;
    cin>>money;
           
    cout<<"select what you want to buy"<<endl;
    cout<<"1.Book\t\t 6.USB"<<endl;
    cout<<"2.Pencil\t 7.CD"<<endl;
    cout<<"3.Pen\t\t 8.DVD"<<endl;
    cout<<"4.Ruber\t\t 9.Flash Card"<<endl;
    cout<<"5.Ruler\t\t 10.Finish"<<endl;
    cout<<"Enter your choice here"<<endl;
    cin>>choice;
            




        switch(choice){

 case (1):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought"<<x<<" books"<<endl;
        spent=prices[0]*x;
        calc=money-spent;
        cout<<"You spent\b"<< spent <<"\bmoney"<<endl;
        cout<<"credit left :"<< calc <<""<<endl;
        cout<<"Do you want to continue purchasing\n1.Yes\n2.No"<<endl;
        cin>>y;
        if (y = 1) {
            return main();
        }

        else
        {
        cout<<"Thanks for using our Buying machine"<<endl;
        return 0;
        }
        return 1;
        }

 case (2):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return main();
        }
 case (3):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }


 case (4):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (5):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (6):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (7):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (8):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (9):{
        cout<<"how many items do you want to buy?"<<endl;
        cin>>x;
        cout<<"you have bought books"<<endl;
        return 1;
        }

 case (10):{
        cout<<"thank you for using buying machine"<<endl;
        return 0;
        }

        }







}

Please mention problem also.

I would consider replacing your "return" statements with "break" within your switch. Then you could do something along the lines of:

case(1):
   ...
   ...
   keep buying?
   if (answer != y && answer != Y)
       break;
case(2):
   ...
   ...
   //etc. etc.

Please mention problem also.

The problem is mentioned in the attached pdf file. I would need some help creating a function to call the prices of the items, do the calculations within function and then call the result when printing. thanks for answering.

thanks