CSCI 131 Techniques of Programming--Spring 2014

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Solution to Lab 3 grades.cc

//**********************************************************************
// grades.cc
//     Author:  Royden/King
//     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 )
{
    int   test1;
    int   test2; 
    int   test3;         // three test grades for a student
    float average;       // average of a student's three grades
    
    //  Prompt the user for the input
    
    cout << "Enter 3 grades for a student: ";
    cin >> test1 >> test2 >> test3;
    cout << endl;
    
    //  Determine if the data is valid and calculate the average if it is
    
    if ((test1 < 0) || (test2 < 0) || (test3 < 0)) {
        cout << "Invalid data." << endl;
        return 1;
    }
    else {
        average = (test1 + test2 + test3) / 3;
        cout << "Student average = " << average << endl;
    	
    	//  Print a message saying that the student is passing or failing
    
        if (average >= 60.0) {
            cout << "Student is passing";
            if (average < 70.0)
                cout << ", but marginal";
            cout << "." << endl;
        } // if

        else
            cout << "Student is failing!" << endl;
    } //else    
    return 0;
} // main

CSCI 131: Techniques of Programming
Last Modified: February 10, 2014
Page Expires: February 10, 2015