c-resources/CPlusPlus20ForProgrammers-m.../examples/ch03/fig03_02.cpp

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// fig03_02.cpp
// Solving the class-average problem using sentinel-controlled iteration.
#include <iostream>
#include <iomanip> // parameterized stream manipulators
using namespace std;
int main() {
// initialization phase
int total{0}; // initialize sum of grades
int gradeCounter{0}; // initialize # of grades entered so far
// processing phase
// prompt for input and read grade from user
cout << "Enter grade or -1 to quit: ";
int grade;
cin >> grade;
// loop until sentinel value is read from user
while (grade != -1) {
total = total + grade; // add grade to total
gradeCounter = gradeCounter + 1; // increment counter
// prompt for input and read next grade from user
cout << "Enter grade or -1 to quit: ";
cin >> grade;
}
// termination phase
// if user entered at least one grade
if (gradeCounter != 0) {
// use number with decimal point to calculate average of grades
double average{static_cast<double>(total) / gradeCounter};
// display total and average (with two digits of precision)
cout << "\nTotal of the " << gradeCounter
<< " grades entered is " << total;
cout << setprecision(2) << fixed;
cout << "\nClass average is " << average << "\n";
}
else { // no grades were entered, so output appropriate message
cout << "No grades were entered\n";
}
}
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