#include <iostream>
using namespace std;
 
int main()
{
  char grade;
  cout << "What is your grade? [A, B, C, D, or F]: ";
  cin >> grade;
  cin.ignore(1000, 10);
 
  switch (grade)
  {  // start here with switch OFF
    case 'A':                               // if grade is 'A', turn switch ON
    case 'a':                               // if grade is 'a', turn switch ON
      cout << "Excellent" << endl;          // do this if switch is ON
      break;                                // skip to closing curly-brace if switch is ON
    case 'B':                               // if grade is 'B', turn switch ON  
    case 'b':                               // if grade is 'b', turn switch ON  
      cout << "Good" << endl;               // do this if switch is ON  
      break;                                // skip to closing curly-brace if switch is ON
    case 'C':                               // if grade is 'C', turn switch ON  
    case 'c':                               // if grade is 'c', turn switch ON  
      cout << "Average" << endl;            // do this if switch is ON  
      break;                                // skip to closing curly-brace if switch is ON
    case 'D':                               // if grade is 'D', turn switch ON  
    case 'F':                               // if grade is 'F', turn switch ON  
    case 'd':                               // if grade is 'd', turn switch ON  
    case 'f':                               // if grade is 'f', turn switch ON  
      cout << "See you next year" << endl;  // do this if switch is ON  
      break;                                // skip to closing curly-brace if switch is ON
    default:                                // turn switch ON  
      cout << "Invalid: " << grade << endl; // do this if switch is ON  
  }                                         // this is the closing curly-brace  
}