How can I get a variable in one function to the next.

[whitesnow]

I need to get the variable "cost" in function get_item, into the function get_discount.

float get_item() //Getting information on the items.
{   
    char item [20];
    float price;
    float quantity;
    float cost;
    
       cout << "Enter the item name: ";
            cin >> item;

       do {
               cout << "Enter the items price: $";
               cin >> price;
                   if (price < 0)
                    {
                        cout << "Prices cannot be negative, please enter a valid price." << endl;
                    }
          }
                while (price <0);
            do {   
                cout << "Enter the quantity you want to purchase: ";
                cin >> quantity;
                   if (quantity <0)
                     {
                       cout << "Item quantity cannot be negative, please enter a valid amount." << endl;
                     }
                     cost=price*quantity; // This is what I want to send, cost.
                }
                while (quantity <0);
                 
                 
                
}     





float get_discount() //Getting information on the discount.
{

    float discount;
    float dcost;                         // I need cost to be here as dcost, is that possible?
    do {
        cout << "Enter percent discount here: %";
        cin >> discount;
         if (discount < 0)
                  {
                     cout << "Discount cannot be negative, please enter a valid discount." << endl;
                  }
                  discount = (discount * 0.01f);
                  
       }
       
                 while (discount <0);
         
}

[firedraco]

Pass it as a parameter to get_discount().

[whitesnow]

Can you show me how to do that please? I have been trying for so long but I keep typing it up wrong or something and I get errors! All week I have been stuck here!

[bluezor]

Passing a parameter -

void myFunction(int myNumber)
{
    do something with myNumber
}

int main()
{
    int coolNumber
    myFunction(coolNumber);
}

[whitesnow]

Oh man ... I think I messed this assignment up. Cause in my first function nothing is getting done to "mynumber" all I wanted was to get the cost variable down to the next one.

Thanks for help.

[bluezor]

You may also need to return the value after doing whatever you want to do though, since you aren't directly modifying the address itself.

void myFunction(int myNumber)
{
    myNumber + 5
    return myNumber
}

int main()
{
    int coolNumber = 0
    myFunction(coolNumber)
    cout coolNumber
}

In that case, coolNumber would be 0 + 5 = 5.

[jRaskell]

void myFunction(int myNumber)
{
    myNumber + 5
    return myNumber
}

int main()
{
    int coolNumber = 0
    myFunction(coolNumber)
    cout coolNumber
}
 

counting all the missing semicolons as a single problem, I count 4 problems with that code. 3 of them compile errors.

1. No semicolons anywhere.

2. Function is declared as type void, yet it returns an int.

3. cout has no extraction operator ( << ).

4. Logic error. coolNumber will still be zero after the call to myFunction.

[jsmith]

Plus the semantic error that the expression

myNumber + 5

does absolutely nothing...

[bluezor]

Sorry, it was just a quick fail pseudo-code example about returning.