fig02_22.cpp

来自「这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to pr」· C++ 代码 · 共 88 行

// Fig. 2.22: fig02_22.cpp
// Counting letter grades
#include <iostream>

using std::cout;
using std::cin;
using std::endl;

int main()
{
   int grade,       // one grade
       aCount = 0,  // number of A's
       bCount = 0,  // number of B's
       cCount = 0,  // number of C's
       dCount = 0,  // number of D's
       fCount = 0;  // number of F's

   cout << "Enter the letter grades." << endl
        << "Enter the EOF character to end input." << endl;

   while ( ( grade = cin.get() ) != EOF ) {

      switch ( grade ) {      // switch nested in while

         case 'A':  // grade was uppercase A
         case 'a':  // or lowercase a
            ++aCount;         
            break;  // necessary to exit switch

         case 'B':  // grade was uppercase B
         case 'b':  // or lowercase b
            ++bCount;         
            break;

         case 'C':  // grade was uppercase C
         case 'c':  // or lowercase c
            ++cCount;         
            break;

         case 'D':  // grade was uppercase D
         case 'd':  // or lowercase d
            ++dCount;         
            break;

         case 'F':  // grade was uppercase F
         case 'f':  // or lowercase f
            ++fCount;         
            break;

         case '\n': // ignore newlines,  
         case '\t': // tabs, 
         case ' ':  // and spaces in input
            break;

         default:   // catch all other characters
            cout << "Incorrect letter grade entered."
                 << " Enter a new grade." << endl;
            break;  // optional
      }
   }

   cout << "\n\nTotals for each letter grade are:" 
        << "\nA: " << aCount 
        << "\nB: " << bCount 
        << "\nC: " << cCount 
        << "\nD: " << dCount
        << "\nF: " << fCount << endl;

   return 0;
}



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