void totalcat(fstream &file) // i get 0 for every catagory { int cat,sale = 0; i

Question

void totalcat(fstream &file) // i get 0 for every catagory
{
    int cat,sale = 0;
    int i = 0;
    inventory items;

    file.open("data.dat",ios::in|ios::binary);
    cout << "Choose the category you want to calculate"<<endl;

    do
    {
        cout<< "choose number 1-3 :"<<endl;
        cout<< "1.) Appliance "<< " 2.) Kitchenware "<<" 3.) Tool"<<endl;
        cout << "category :";
        cin>>cat;
        switch(cat)
        {
            case 1:
                strcpy(items.category, "Appliance");
                // items.category = "Appliance" // how come you are assigning catagory in your total calculation?
                break;
            case 2:
                strcpy(items.category, "Kitchenware");
                // items.category = "Kitchenware" // how come you are assigning catagory in your total calculation?
                break;
            case 3:
                strcpy(items.category, "Tool");
                // items.category = "Tool" // how come you are assigning catagory in your total calculation?
                break;
            default : cout << "Please input number between 1 and 3 !"<<endl;;
        }
    }
    while ((cat<1)||(cat>3));

    if (cat==1)
    {
        while (!file.eof())
        {
            file.seekg((i)*sizeof(items), ios::beg);
            file.read(reinterpret_cast<char *>(&items), sizeof(items));
            if (!file.eof())
            {
                if (items.category == "Appliance")
                    sale = sale + (items.cost * items.quantity);
            }
            i++;
        }
    }
    else if (cat==2)
        while (!file.eof())
        {
            file.seekg((i)*sizeof(items), ios::beg);
            file.read(reinterpret_cast<char *>(&items), sizeof(items));
            if (!file.eof())
            {
                if (items.category == "Kitchenware")
                sale = sale + (items.cost * items.quantity);
            }
            i++;
        }
    else if (cat==3)
        while (!file.eof())
        {
            file.seekg((i)*sizeof(items), ios::beg);
            file.read(reinterpret_cast<char *>(&items), sizeof(items));
            if (!file.eof())
            {
            if (items.category == "Tool")
                sale = sale + (items.cost * items.quantity);
            }
            i++;
        }
    else
    {
        cout << "you can only choose number 1-3" << endl;
    }
    cout <<"Total sales of selected category is: "<< sale<<endl<<endl;

    file.close();

}

Explanation / Answer

you can not use "==" for string comparision. try this

if(strcmp(item.category,"Appliance")==0)

sale = sale + (item.cost * items.quantity);

if(strcmp(item.category,"Kitchenware")==0)

sale = sale + (item.cost * items.quantity);

if(strcmp(item.category,"Tool")==0)

sale = sale + (item.cost * items.quantity);

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