CSCI 131 Techniques of Programming--Spring 2014

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Solution to Lab 3 grades2.cc

//**********************************************************************
// grades2.cc
//     Author:  King/Royden
//     Date:    February 10, 2014
//     Class:   CSCI 131
//     Purpose: This program determines whether a student is passing
//              based on the average of his or her three grades
//     Input :  (from standard input) The three grades, as integers
//     Output:  (to standard output) The student's average
//**********************************************************************

#include <iostream>

using namespace std;

int main ( void )
{
   float test1;         // Grade #1
   float test2;         // Grade #2
   float test3;         // Grade #3
   float average ;      // Average of a student's three grades
   int averageRounded;  // Rounded Average
   char grade;          // Overall Grade

   // Prompt the user for the input

   cout << "Enter 3 grades for a student: ";
   cin >> test1 >> test2 >> test3;

   // Calculate average and rounded average

   average = (test1 + test2 + test3)/(3.0);
   averageRounded = int(average + 0.5); 
   
   // Determine the letter grade

   if ((test1 < 0) || (test2 < 0) || (test3 < 0)) {
      cout << "Invalid data." << endl;
      return 1; 
   }
   else if (averageRounded >= 90) {
      grade = 'A';
   }
   else if (averageRounded >= 80) {
      grade = 'B';
   }
   else if (averageRounded >= 70) {
      grade = 'C';
   }
   else if (averageRounded >= 60) {
      grade = 'D';
   }
   else {
      grade = 'F';
   }

   // Print results
       
   cout << endl << "Exams: " << test1 << " "  << test2 << " " << test3 << endl;
   cout << "Average: " << averageRounded << "    " << "Grade: " << grade << endl;

   return 0;
} // end of main

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CSCI 131: Techniques of Programming
Last Modified: February 10, 2014
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