Question

25. In this exercise, you create a program for the sales manager at Computer Haven, a small business that offers motivational seminars to local companies. Figure 7-53 shows the charge for attending a seminar. Notice that the charge per person depends on the number of people the company registers. For example, the cost for four registrants is $400; the cost for two registrants is $300. The program should allow the sales manager to enter the number of registrants for as many companies as needed. When the sales manager has finished entering the data, the program should calculate and display the total number of people registered, the total charge for those registrants, and the average charge per registrant. For example, if one company registers four people and another company registers two people, the total number of people registered is six, the total charge is $700, and the average charge per registrant is $116.67. ADVANCED Number of people a company registers 1 -3 Charge per person ($) 150 100 4-9 10 or more 90 Figure 7-53 Create an IPO chart for the problem, and then desk-check the algorithm appropriately. List the input, processing, and output items, as well as the algorithm, in a chart similar to the one shown earlier in Figure 7-42. Then code the algorithm into a program. b. Desk-check the program using the same data used to desk-check the algorithm. d. If necessary, create a new project named Advanced25 Project, and save it in the Cpp8 Chap07 folder. Enter your C++ instructions into a source file named Advanced25.cpp. Also enter appropriate comments and any additional instructions required by the compiler. Display the average charge with two decimal places. Save and then run the program. Test the program using the same data used to desk-check the program. C e

Answer 1

Part a and b cannot be answered due to lack of information (Figure 7-42 is not provided). I am only answering parts c, d and e.

Algorithm

Step 1: Input number of participants for each company.

Step 2: Calculate the cost for the participants of a particular company and add to the total cost. Add the number of participants of each company to the total number of registrants. Calculate the average cost per participant.

Step 3: Repeat steps 1 and 2 for as many companies as required.

Step 4: Display the total number of participants, total charge for the registrants and the average charge per participant.

C++ Code

#include<iostream>
using namespace std;

class ComputerHaven
{
   int people; //holds the total number of registrants
   double total_cost; //holds the total cost
   double avg_cost; //holds the average cost per person
   public:
       ComputerHaven() //default constructor
       {
           people=0;
           total_cost=0.0;
           avg_cost=0.0;
       }
       void getData();
       void calculate(int p);
       void display();
};

void ComputerHaven::getData() //inputs data
{
   int choice=1, participants, i=1; //variables to hold the choice, participant for each company and a count for the company being entered
   while(choice==1) //loop to enter the number of registrants for as many companies as needed
   {
       cout<<"Company "<<i;
       cout<<"\nEnter number of participants: ";
       cin>>participants;
       if(participants>0)
       {
           calculate(participants); //cost is calculated only for valid number of participants
           i++; //company number increased only if valid number of participants is entered
       }
       else
           cout<<"Number of participants must be greater than or equal to 1.\n";
       cout<<"Press 1 to enter registrants for more companies, press 0 to stop: ";
       cin>>choice;
   }
}

void ComputerHaven::calculate(int p) //calculates number of participants, total cost and average cost
{
   people+=p;
   if(p>=1 && p<=3)
       total_cost+=(p*150);
   else if(p>=4 && p<=9)
       total_cost+=(p*100);
   else
       total_cost+=(p*90);
   avg_cost=total_cost/people;
}

void ComputerHaven::display() //displays the number of participants, total cost and average cost
{
   cout<<"Total number of people registered: "<<people;
   cout<<"\nTotal charge is: $"<<total_cost;
   cout<<"\nAverage charge per registrant is: $"<<avg_cost;
}

int main() //main function
{
   ComputerHaven obj;
   obj.getData();
   obj.display();
}

Sample Inputs and outputs

1. 4 participants, 2 participants:

Total number of people registered: 6
Total charge is: $700
Average charge per registrant is: $116.67

2. 8 participants, 0 participants, 2 participants, 14 participants

Total number of people registered: 24
Total charge is: $2360
Average charge per registrant is: $98.3333