59 lines
2.4 KiB
C++
59 lines
2.4 KiB
C++
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// fig03_02.cpp
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// Solving the class-average problem using sentinel-controlled iteration.
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#include <iostream>
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#include <iomanip> // parameterized stream manipulators
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using namespace std;
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int main() {
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// initialization phase
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int total{0}; // initialize sum of grades
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int gradeCounter{0}; // initialize # of grades entered so far
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// processing phase
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// prompt for input and read grade from user
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cout << "Enter grade or -1 to quit: ";
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int grade;
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cin >> grade;
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// loop until sentinel value is read from user
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while (grade != -1) {
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total = total + grade; // add grade to total
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gradeCounter = gradeCounter + 1; // increment counter
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// prompt for input and read next grade from user
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cout << "Enter grade or -1 to quit: ";
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cin >> grade;
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}
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// termination phase
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// if user entered at least one grade
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if (gradeCounter != 0) {
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// use number with decimal point to calculate average of grades
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double average{static_cast<double>(total) / gradeCounter};
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// display total and average (with two digits of precision)
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cout << "\nTotal of the " << gradeCounter
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<< " grades entered is " << total;
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cout << setprecision(2) << fixed;
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cout << "\nClass average is " << average << "\n";
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}
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else { // no grades were entered, so output appropriate message
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cout << "No grades were entered\n";
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}
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}
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/**************************************************************************
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* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/
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