C++ Swiches Help

I need help with with my hw. The code bellow is what i have so far but i still need to this part which i cant figure out .


>>>>>If the quantity sold for the product is over 10, then 10% off is applied to the sales. If the quantity sold for the product is over 20 then 25% off is applied to the sales. You must create a function named Calculate which has 2 parameters to calculate the sales and return the sales. See the function maximum on page 251 for reference.<<<<<<

also i cant get the totals at the end to add up.

This is the complete problem if it helps

Problem Description

A mail-order house sells five different products whose retail prices are as follows: product 1, $2.98; product 2, $4.50; product 3, $9.98; product 4, $4.49; and product 5, $6.87. Write an application that reads a series of pairs of numbers as follows:
a) Product number
b) Quantity sold for one day

If the quantity sold for the product is over 10, then 10% off is applied to the sales. If the quantity sold for the product is over 20 then 25% off is applied to the sales. You must create a function named Calculate which has 2 parameters to calculate the sales and return the sales. See the function maximum on page 251 for reference.

Your program must use a switch structure to help determine the retail price for each product. It should calculate and display the total retail value of each product sold last week. Use a sentinel-controlled loop to determine when the program should stop looping and display the final results.

Code:

#include<iostream>
#include <iomanip.h>
using namespace std;


int main()
{
int ProductNumber;
double QuantitySold;
double sum1=0, sum2=0, sum3=0, sum4=0, sum5=0;

cout<<"Enter the product number (1-5) (0 to Stop): ";
cin>>ProductNumber;
cout<<"Enter quantity sold: ";
cin>>QuantitySold;

while (ProductNumber != 0 ){

switch (ProductNumber)
{
case 1:
sum1=(2.98*QuantitySold);
cout<<"The sales for this Product 1 is $ "<<sum1<<endl;
break;

case 2:
sum2=(4.50*QuantitySold);
cout<<"The sales for this Product 2 is $ "<<sum2<<endl;
break;

case 3:
sum3=(9.98*QuantitySold);
cout<<"The sales for this Product 3 is $ "<<sum3<<endl;
break;

case 4:
sum4=(4.49*QuantitySold);
cout<<"The sales for this Product 4 is $ "<<sum4<<endl;
break;

case 5:
sum5=(6.87*QuantitySold);
cout<<"The sales for this Product 5 is $ "<<sum5<<endl;
break;

default:
cout << "Invalid product code: " << ProductNumber
 << "\n Quantity: " << QuantitySold << '\n';
 break;
 

}

cout<<"\nEnter the product number (1-5) (0 to Stop): ";
cin>>ProductNumber;
cout<<"Enter quantity sold: ";
cin>>QuantitySold;
}

cout<<"Total Sales for the week"<<endl;
cout<<"Product 1 $ "<<sum1<<endl;
cout<<"Product 2 $ "<<sum2<<endl;
cout<<"Product 3 $ "<<sum3<<endl;
cout<<"Product 4 $ "<<sum4<<endl;
cout<<"Product 5 $ "<<sum5<<endl;


system ("pause");
 return 0;
}

I would assume that the mystery function should accept the quantity and price of one item as arguments and return the price of this quantity with the discounts applied.

also i cant get the totals at the end to add up.

You need to accumulate the running totals for each item.

You might want to tidy your switch up a bit like this:

Code:

while (ProductNumber != 0 )
{
    float sumVal = 0;

    switch (ProductNumber)
    {
        case 1:
        {
            sum1=(2.98*QuantitySold);
            sumVal = sum1;
        }
        break;
             // more cases..
             //..
        default:
        {
             cout << "Invalid product code: " << ProductNumber << "\n Quantity: " << QuantitySold << '\n';
        }
        break;
    }
    cout<<"The sales for this Product" << ProductNumber << " is $ "<< sumVal <<endl;
}

Correction: You may actually want to indent, because otherwise you are making the code very hard for us to read.

See Lesson 4: Functions. Also, as has been indicated, you need to learn how to indent your code.

Where is your calculate function? I don't even see you calling it in your code...

Ok this is my revised code i get a error saying that QuantitySold cant be used as a function and sorry about not spacing my code in the OP

Code:

#include<iostream>
#include <iomanip.h>
using namespace std;


int main()
{
int ProductNumber;
double QuantitySold;
double Calculate;
double sum1=0, sum2=0, sum3=0, sum4=0, sum5=0;

       cout<<"Enter the product number (1-5) (0 to Stop): ";
       cin>>ProductNumber;
       cout<<"Enter quantity sold: ";
       cin>>QuantitySold;
       
       if (QuantitySold() <= 10 )
         Calculate = 1 ;
         
         
      if (QuantitySold() >= 10 && <=20)
         Calculate = 0.10 ;
         
      if (QuantitySold() >20 )
         Calculate = 0.25 ;  

while (ProductNumber != 0 ){
      


      switch (ProductNumber)
{
       case 1:
       sum1+=(2.98*QuantitySold*Calculate);
       cout<<"The sales for this Product 1 is $ "<<sum1<<endl;
       break;

       case 2:
       sum2=(4.50*QuantitySold*Calculate);
       cout<<"The sales for this Product 2 is $ "<<sum2<<endl;
       break;

       case 3:
       sum3+=(9.98*QuantitySold*Calculate);
       cout<<"The sales for this Product 3 is $ "<<sum3<<endl;
       break;

       case 4:
       sum4+=(4.49*QuantitySold*Calculate);
       cout<<"The sales for this Product 4 is $ "<<sum4<<endl;
       break;

       case 5:
       sum5+=(6.87*QuantitySold*Calculate);
       cout<<"The sales for this Product 5 is $ "<<sum5<<endl;
       break;

       default:
       cout << "Invalid product code: " << ProductNumber
       << "\n Quantity: " << QuantitySold << '\n';
       break;
 

}

 cout<<"\nEnter the product number (1-5) (0 to Stop): ";
 cin>>ProductNumber;
 cout<<"Enter quantity sold: ";
 cin>>QuantitySold;
}

 cout<<"Total Sales for the week"<<endl;
 cout<<"Product 1 $ "<<sum1<<endl;
 cout<<"Product 2 $ "<<+sum2<<endl;
 cout<<"Product 3 $ "<<sum3<<endl;
 cout<<"Product 4 $ "<<sum4<<endl;
 cout<<"Product 5 $ "<<sum5<<endl;


system ("pause");
return 0;
}

Code:

if (QuantitySold() <= 10 )
         Calculate = 1 ;
         
         
      if (QuantitySold() >= 10 && <=20)
         Calculate = 0.10 ;
         
      if (QuantitySold() >20 )
         Calculate = 0.25 ;

Remove the parenthesis after quantitysold.

Ok i got it working but its giving me the wrong answer For example if i enter product 2 and sold 2 i get $2.50

Oh and where should i put

Code:

setprecision( 2 )

Your if statements are screwey. Try this:

Code:

if(QuantitySold <= 10 )
         Calculate = 1 ;
else if (QuantitySold > 10 && QuantitySold<=20)
         Calculate = 0.10 ;
else
         Calculate = 0.25 ;

Also you need to have those statements in your while loop as well.

Originally Posted by 123456tacos

Oh and where should i put

Code:

setprecision( 2 )

Read: How to format output with cout - FAQ()

ok thanks and i got the code part

Code:

cout << setiosflags( ios::fixed | ios::showpoint )

im just asking where should i place it and do i have to

Code:

setprecision( 2 )

for every result or just one?

Either or works. Here is a better reference If you always want it to be a certain precision than you can just do it once as cout.precision(2) for instance.

Don't forget this, you already have the code in place you just need to create a function for it.

You must create a function named Calculate which has 2 parameters to calculate the sales and return the sales.

replace this: sum1+=(2.98*QuantitySold*Calculate); with your function call and create a function along these lines:

Code:

double calculate(const double price, int quantity)
{
    double sum = 0;
    sum = price * static_cast<double>(quantity);

    if(quantity > 10 && quantity <= 20)
        return sum *= .9;
    else if(quantity > 20)
        return sum *= .75;

    return sum;
}