classaverage.cpp

C++大学简明教程,解压就行没有密码。希望对大家有用

// Tutorial 7: ClassAverage.cpp
// This application enables user calculate the average of grades.
#include <iostream> // required to perform C++ stream I/O
#include <iomanip>  // required for parameterized stream manipulators

using namespace std; // for accessing C++ Standard Library members

// function main begins program execution
int main()
{
   // define variables
   int total = 0;      // stores total of grades entered
   int gradeCount = 0; // stores number of grades entered
   int grade;          // stores grade entered at prompt

   // prompt user for and input grade 
   cout << "\nEnter grade (-1 to end): ";
   cin >> grade;
 
   while ( grade != -1 )
   {
      total += grade; // add input to total
      gradeCount++; // increment grade counter

      // prompt user for and input next grade 
      cout << "Enter grade (-1 to end): ";
      cin >> grade;  
   } // end while

   // display error message if no grades were entered
   if ( gradeCount == 0 )
   {
      cout << "\nNo grades were entered.\n" << endl;
   } // end if
   else // otherwise calculate and display average
   {
      // calculate the average of the grades entered
      double average = static_cast< double >( total ) / gradeCount;

      // format output and display the average
      cout << fixed << setprecision( 1 );
      cout << "\nAverage grade: " << average << endl << endl;
   } // end else

   return 0; // indicate that program ended successfully

} // end function main


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