Record Structures program

Record Structures Functions.cpp

//Libraries and other used mediums
#include "Header.h"
#include <iostream>
#include <iomanip>
#include <cmath>

using namespace std;

//Definitions
//function to display student records
void displayrecord(gRec record)
{
	cout << "Student Name:    " << record.name << endl;
	cout << "Student ID:      " << right << setw(5) << record.studID << endl
		 << "Student Grades:  " << setw(2) << record.grades[0] << ", "
									   	   << record.grades[1] << ", "
										   << record.grades[2] << ", "
										   << record.grades[3] << "\n"
		 << "Student Average: " << setw(2) << record.avgscore << endl
		 << "Student Grade:   " << setw(1) << record.lettergrade << endl << endl;

}

//function to compute average and populate average field
int gradeavg(gRec record, double *average)
{
	int numt(0);

	for (int h = 0; h != 4; h++)
	{
		numt += record.grades[h];
	}

	record.avgscore = (numt / 4);
	*average += record.avgscore;
	return record.avgscore;
}

//function to computer letter grade and populate letter grade field
string lgrade(gRec record)
{
	if (record.avgscore >= 90 && record.avgscore <= 100)
	{
		record.lettergrade = "A";
	}
	else if (record.avgscore >= 80 && record.avgscore <= 89)
	{
		record.lettergrade = "B";
	}
	else if (record.avgscore >= 70 && record.avgscore <= 79)
	{
		record.lettergrade = "C";
	}
	else if (record.avgscore >= 60 && record.avgscore <= 69)
	{
		record.lettergrade = "D";
	}
	else
	{
		record.lettergrade = "F";
	}
	return record.lettergrade;
}

//function to compute class average
double classavg(double total, double constant)
{
	double classaverage = (total / constant);
	return classaverage;
}

//visual studio kept giving me errors, had to create write function
//function to write and point data for calculating class averages & stand dev
void writedata(gRec record, double average, double *standev)
{
	double  dev(0);
	dev = (record.avgscore - average)*(record.avgscore - average);
	*standev += dev;
}

//function to compute class standard deviation
double standarddev(double standev, int constant)
{
	double varience(0);
	varience = standev / (constant - 1);
	standev = sqrt(varience);
	return standev;
}


//function to display class average and standard deviation
void displayclass(double standdev, double average)
{
	cout << "Class Average: " << setprecision(3) << setw(6) << average << endl;
	cout << "Standard Dev: " << setprecision(3) << setw(7) << standdev << endl << endl;
}

Record Structures Main.cpp

//Libraries and other used mediums
#include "header.h"
#include <string>
#include <iostream>
#include <fstream>
using namespace std;

//Main
int main()
{
	//Variables
	const int sSIZE = 5;
	const double dSIZE = 5.0;
	double classdev(0), standev(0), classaverage(0), buffer(0);
	gRec students[sSIZE];

	ifstream inFile("Student Data.txt");

	//Callings
	//Individual student outputs
	for (int k = 0; k != sSIZE; k++)
	{
		getline(inFile, students[k].name);
		inFile >> students[k].studID;

		for (int i = 0; i != gSIZE; i++)
		{
			inFile >> students[k].grades[i];
		}

		string str;
		getline(inFile, str);
		students[k].avgscore = gradeavg(students[k], &buffer);
		students[k].lettergrade = lgrade(students[k]);
		displayrecord(students[k]);
	}
	classaverage = classavg(buffer, dSIZE);

	for (int v = 0; v != sSIZE; v++)
	{
		writedata(students[v], classaverage, &standev);
	}

	classdev = standarddev(standev, sSIZE);
	displayclass(classdev, classaverage);
	system("pause");
}

Record Structures.h

#ifndef HEADER_H_
#define HEADER_H_

//Libraries and other used mediums
#include <string>
using namespace std;

//Variables
const int gSIZE = 4;

//Declarations
struct gRec {      
	string name;
	int studID;
	int grades[gSIZE];
	int avgscore;
	string lettergrade;
};

void displayrecord(gRec);
int gradeavg(gRec, double*);
string lgrade(gRec);
double classavg(double, double);
void writedata(gRec, double, double*);
double standarddev(double, int);
void displayclass(double, double);
#endif