// Program file"  input.cpp
// this program demonstrates reading data from a file

#include <iomanip>
#include <iostream>
#include <fstream>
using namespace std;

void heading();
void getrecord(long int &s, int &g1, int &g2);
float calcaverage(int g1, int g2);
void writerecord(long int s, int g1, int g2, float a);

ifstream infile;

int main()
{
	long int ssn;
	int grade1, grade2;
	float average;

	system("cls");
	infile.open("f:/csc-160/csc-160/grade.dat");
	heading();
	getrecord(ssn, grade1, grade2);
	while (ssn != 0)
	{
		average = calcaverage(grade1, grade2);
		writerecord(ssn, grade1, grade2, average);
		getrecord(ssn, grade1, grade2);
	}
	system("pause");
	infile.close();
	return 0;
}

void heading()
{
	cout << "SocSecNum   Grade1  Grade2  Average" << endl;
}

void getrecord(long int &s, int &g1, int &g2)
{
	infile >> s >> g1 >> g2;
}

float calcaverage(int g1, int g2)
{
	return (g1 + g2) / 2.0;
}

void writerecord(long int s, int g1, int g2, float a)
{
	cout << setw(9) << s << setw(5) << "  "
	     << setw(3) << g1 << setw(5) << "  "
	     << setw(3) << g2 << setw(5) << "  "
	     << setw(5) << a  << endl;
}