Question

In this lab, you write a while loop that uses a sentinel value to control a loop in a C++ program that has been provided. You also write the statements that make up the body of the loop.
The source code file already contains the necessary variable declarations and output statements. Each theater patron enters a value from 0 to 4 indicating the number of stars the patron awards to the Guide’s featured movie of the week. The program executes continuously until the theater manager enters a negative number to quit. At the end of the program, you should display the average star rating for the movie.

Instructions
Ensure the source code file named MovieGuide.cpp is open in your code editor.

Write the while loop using a sentinel value to control the loop, and write the statements that make up the body of the loop. The output statements within the loop have already been written for you.

Ensure you include the calculations to compute the average rating.
Execute the program by clicking the Run button.
Input the following: 0, 3, 4, 4, 1, 1, 2, -1

Ensure the average output is correct.

Strictly use the given code
// MovieGuide.cpp - This program allows each theater patron to enter a value from 0 to 4
// indicating the number of stars that the patron awards to the Guide's featured movie of the
// week. The program executes continuously until the theater manager enters a negative number to
// quit. At the end of the program, the average star rating for the movie is displayed.

#include
#include
using namespace std;

int main()
{

// Declare and initialize variables.
double numStars; // star rating.
double averageStars; // average star rating.
double totalStars = 0; // total of star ratings.
int numPatrons = 0; // keep track of number of patrons


// This is the work done in the housekeeping() function
// Get input.
cout << "Enter rating for featured movie: ";
cin >> numStars;

// This is the work done in the detailLoop() function
// Write while loop here

// This is the work done in the endOfJob() function
cout << "Average Star Value: " << averageStars << endl;
return 0;
} // End of main()

Answer 1

Following are the C++ program to calculating the average value.

Program Explanation:

• Defining header file.
• Defining the main method.
• Defining three double variable "numStars,averageStars, and totalStars", and one integer variable "numPatrons".
• After declaring a variable, an input method is used that inputs an integer variable.
• In the next step, a while loop is declared that uses an integer variable to the check value between 0 to 4.
• Inside the loop, it adds the integer variable value and uses a conditional statement that checks integer value equal to 0, that hold 0 value into the "averageStars".
• In the else block it calculates the average value and prints its value.

Program:

#include <iostream>//defining header file  

#include <string>//defining header file  

using namespace std;

int main()//main method

{

double numStars,averageStars,totalStars=0; // defining a double variable

int numPatrons = 0; //defining integer variable

cout << "Enter rating for featured movie: ";//print message

cin >> numStars;//input integer variable

while(numStars >= 0 && numStars<=4)//using while loop that use integer variable to check value in between 0 to 4

{

   numPatrons++; // increasing integer variable value

   totalStars += numStars; // using totalStars that adds numStars value in it

   cout << "Enter rating for featured movie: ";//print message

   cin >> numStars;//input double value

  }

if(numPatrons == 0)//using if block that check integer value equal to 0

      averageStars = 0;//holding value into averageStars

else//else block

      averageStars = totalStars/numPatrons;//calculating averageStars value

cout << "Average Star Value: " << averageStars << endl;//print message with averageStars value

return 0;

}

Output:

Please find the attached file.

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