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// Fig. 2.22: fig02_22.cpp
// Counting letter grades.
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
// function main begins program execution
int main()
{
int grade; // one grade
int aCount = 0; // number of As
int bCount = 0; // number of Bs
int cCount = 0; // number of Cs
int dCount = 0; // number of Ds
int fCount = 0; // number of Fs
cout << "Enter the letter grades." << endl
<< "Enter the EOF character to end input." << endl;
// loop until user types end-of-file key sequence
while ( ( grade = cin.get() ) != EOF ) {
// determine which grade was input
switch ( grade ) { // switch structure nested in while
case 'A': // grade was uppercase A
case 'a': // or lowercase a
++aCount; // increment aCount
break; // necessary to exit switch
case 'B': // grade was uppercase B
case 'b': // or lowercase b
++bCount; // increment bCount
break; // exit switch
case 'C': // grade was uppercase C
case 'c': // or lowercase c
++cCount; // increment cCount
break; // exit switch
case 'D': // grade was uppercase D
case 'd': // or lowercase d
++dCount; // increment dCount
break; // exit switch
case 'F': // grade was uppercase F
case 'f': // or lowercase f
++fCount; // increment fCount
break; // exit switch
case '\n': // ignore newlines,
case '\t': // tabs,
case ' ': // and spaces in input
break; // exit switch
default: // catch all other characters
cout << "Incorrect letter grade entered."
<< " Enter a new grade." << endl;
break; // optional; will exit switch anyway
} // end switch
} // end while
// output summary of results
cout << "\n\nTotals for each letter grade are:"
<< "\nA: " << aCount // display number of A grades
<< "\nB: " << bCount // display number of B grades
<< "\nC: " << cCount // display number of C grades
<< "\nD: " << dCount // display number of D grades
<< "\nF: " << fCount // display number of F grades
<< endl;
return 0; // indicate successful termination
} // end function main
/**************************************************************************
* (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
* Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/
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