CS 10 Classroom Session 4 User Input Validation

inputValidation.cpp

#include <iostream>

using namespace std;

int main() {
  int score1, score2;

  // collect score 1
  cout << "Enter your score on the first exam (0 - 100): ";
  cin >> score1;

  while (score1 > 100 || score1 < 0) {
    cout << "Score not in the range 0-100. Please re-enter your score on the first exam: ";
    cin >> score1;
  }

  cout << score1 << endl;

  // collect score 2
  cout << "Enter your score on the second exam (0 - 100): ";
  cin >> score2;

  while (score2 > 100 || score2 < 0) {
    cout << "Score not in the range 0-100. Please re-enter your score on the second exam: ";
    cin >> score2;
  }

  // determine necessary score on final exam 
  const int PASSING_GRADE = 70;
  int necessary_grade = PASSING_GRADE * 3 - score1 - score2;

  if (necessary_grade > 100) {
    cout << "You cannot pass the course" << endl;
  } else {
    cout << "You need a " << necessary_grade << " to pass." << endl;
  }

  return 0;
}