/**************************************************/
/*                                                */
/* This program will calculate a student's test   */
/* average for three test scores.  It will do     */
/* this for students until there are no more      */
/* students to enter.                             */
/*                                                */
/**************************************************/

#include <iostream>
#include <iomanip>
#include <string>

#define NUMTESTS 3

using namespace std;

/**************************/
/*  Function Prototypes   */
/**************************/
// Get the student's SSN
string getSSN();
// Get each test score
float getTestScore();
// Calculate the average of the three test scores
float calcAvg(float score1, float score2, float score3);
// Print student's SSN and test average
void printStuInfo(string ssn, float testAvg);

int main()
{
  float test1, test2, test3;
  float avg;
  string ssn;

  ssn = getSSN();
  while (ssn != "0")
    {
      test1 = getTestScore();
      test2 = getTestScore();
      test3 = getTestScore();

      avg = calcAvg(test1, test2, test3);
      
      printStuInfo(ssn, avg);

      ssn = getSSN();
    }

  return 0;
}  // end main


string getSSN()  
{
  string socialNum;

  cout << "Enter student's SSN (0 to end program): ";
  cin >> socialNum;

  return socialNum;
}  // end function getSSN


float getTestScore()
{
  float score;

  cout << "Enter a test score for a student: ";
  cin >> score;

  return score;
}  // end function getTestScore


float calcAvg(float score1, float score2, float score3)
{
  float sum;
  float ave;

  sum = score1 + score2 + score3;
  ave = sum / NUMTESTS;

  return ave;
}  // end function calcAvg


void printStuInfo(string ssn, float testAvg)
{
  cout << fixed << showpoint << setprecision(2);
  cout << endl << endl;
  cout << "Test average for " << ssn << " is " << testAvg << endl << endl;

  return;
}  // end function printStuInfo