Question

Using the pseudocode found below, write only the actual (C++) code for this program. Include all libraries.

Specification:

Write a program that will repeatedly ask the user for quiz grades in the range from 0 to 20. Any negative value will act as a sentinel. When the sentinel is entered compute the average of the grades entered.

Design:

Constants

None

Variables

float grade

float total = 0

int count = 0

float average

-------

Inital Algorithm

Repeatedly ask user for grades until sentinel is entered

Compute average

Display average

Refined Algorithm

Repeatedly ask user for grades until sentinel is entered

Do

Display "Enter grade (0 – 20, or negative to quit) ---> "

Input grade

If grade >= 0 And grade <= 20 Then

total += grade

count ++

Else If grade > 20 Then

Display "Invalid grade. Try again." & EOL

End

While grade >= 0

Compute average

average = total / count

Display average

Set formatting for 2 decimal places

Display "The average of " & count & " grades was " & average & EOL

Answer 1

C++ Program:

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{
    float grade;
    float total = 0;
    int count = 0;
    float average;
    
    do {
        cout << "Enter grade (0-20, or negative to quit) --> ";
        cin >> grade;
        
        if ((grade>=0) && (grade<=20)) {
            total += grade;
            count += 1;
        }
        else if (grade > 20) {
            cout << "Invalid grade, Try again!!" << endl;
        }
    } while(grade>=0);
    
    average = total / count;
    cout << "\nThe average of " << count << " quiz marks is : " << fixed << setprecision(2) << average << endl;
    
    return 0;
}

Output:

Thumbs Up Please !!!