Question

I'm having trouble figuring out the C++ code for the following assignment, keep getting errors. Help?

Write a program that calculates a discount for buying certain quantities of coffee. Consider the following scenario:

A coffee company sells a pound of coffee for $12.99. Quantity discounts are given according to the table below.

Quantity	Discount
5-9	5%
10-19	10%
20-29	15%
30 or more	20%

Write a program that asks for the number of pounds purchased and computes the total cost of the purchase. Make sure the output formatting is appropriate for the values provided. Be sure to include comments throughout your code where appropriate.

Input validation: Decide how the program should handle an input of less than 0.

Answer 1

#include <iostream>

using namespace std;

int main()
{
    const double UNIT_PRICE = 12.99;
    int n;
    double totalPrice;
    
    cout<<"Enter quantity: ";
    cin>>n;
    
    if(n>0){
    
    totalPrice = n*UNIT_PRICE;
    if(n>5){
        if(n<9){
            totalPrice -= (totalPrice*5/100.0);
        }
        else if(n<20){
            totalPrice -= (totalPrice*10/100.0);
        }
        else if(n<30){
            totalPrice -= (totalPrice*15/100.0);
        }
        else{
            totalPrice -= (totalPrice*20/100.0);
        }
    }
    
    cout<<"Total price = "<<totalPrice<<endl;
    }
    return 0;
}