Student data c++ code

This is a discussion on Student data c++ code within the C++ Programming forums, part of the General Programming Boards category; I'll present the assignment questions and then follow it with my solution and my question: The Assignment 1) Write and ...

  1. #1
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    Post Student data c++ code

    I'll present the assignment questions and then follow it with my solution and my question:

    The Assignment
    1) Write and run a C++ program that takes a file (grades.txt) containing the different grades of the students and prints out the following information:

    1) the student’s name,

    2) his score on the Midterm,

    3) his overall homework grade obtained by calculating the average of the 3 higher homework grades over the 5 homework grades given in the input file

    4) his score on the final exam,

    5) his course average calculated as follows: 30% for the midterm, 40 % for the final exam and 30 % for the homework, and finally

    6) his letter grade for the course determined as follows:

    average grade for course

    90 – 100 A

    80 - <<90 B

    70 - <<80 C

    below 70 F where << means less than, but not equal to



    SAMPLE INPUT FILE :

    Fatma, Alhammadi

    90 100

    10 10 10 2 1

    Mariam, ElMazrouei

    90 90

    1 2 3 4 5

    Mohamed, Hamad

    100 100

    10 10 10 10 10

    (In this example, the second input is for the midterm grade and the third one is for the final exam grade.)

    SAMPLE OUTPUT:



    Name Midterm HMAvg Final Avg Grade



    Fatma, Alhammadi 90 100 100 97 A

    Mariam, ElMazrouei 90 80 100 91 A

    Mohammad, Hamad 100 100 100 100 A



    2) Modify the program to add this feature: The user can choose either to print them in alphabetical order or according to their grades. If two students have the same grade, then the alphabetical order is used to order them.

    THE CODE:
    Code:
    # include <iostream>
    # include <string>
    # include <fstream>
    using namespace std;
    struct studentType
    {
    	string firstname;
    	string lastname;
    	double midterm;
    	double final;
    	double homework[5];
    	double hmavg;
    	double average;
    	char grade;
    };
    int arraySize();
    void copyFromFileToArray (studentType *s, int n);
    void displayData (studentType *s, int n);
    void homeworkAverage(studentType *s, int n);
    void averageAll (studentType *s, int n);
    void grade (studentType *s, int n);
    void arrangeAlphabetically(studentType *s, int n);
    void arrangeByGrades(studentType *s, int n);
    int main()
    {
    	int n = arraySize();
    	studentType *s = NULL;
    	s = new studentType[n];
    	copyFromFileToArray(s, n);
    	homeworkAverage(s, n);
    	averageAll(s, n);
    	grade(s, n);
    	cout << "\n\t - Press 1: to print the data in alphabetical order\n";
    	cout << "\t - Press 2: to print the data according to their grades\n";
    	cout << "\n Your Choice is: ";
    	int choice; cin >> choice;
    	switch (choice)
    	{
    	case 1:
    		arrangeAlphabetically(s, n);
    		break;
    	case 2:
    		arrangeByGrades(s, n);
    		break;
    	}
    	displayData(s, n);
    	return 0;
    }
    int arraySize()
    {
    	ifstream inFile;
    	inFile.open("grades.txt");
    	int size = 0;
    	string fn, ln;
    	double m, f;
    	double h[5];
    	while (!inFile.fail())
    	{
    		inFile >> fn; 
    		inFile >> ln;
    		inFile >> m;
    		inFile >> f;
    		for (int j=0; j<5; j++)
    			inFile >> h[j];
    		size++;
    	}
    	inFile.close();
    	return (size-1);
    }
    void copyFromFileToArray(studentType *s, int n)
    {
    	ifstream inFile;
    	inFile.open("grades.txt");
    	for(int i=0; i<n; i++)
    	{
    		inFile >> s[i].firstname;
    		inFile >> s[i].lastname;
    		inFile >> s[i].midterm;
    		inFile >> s[i].final;
    		for (int j=0; j<5; j++)
    			inFile >> s[i].homework[j];
    	}
    	inFile.close();
    }
    void homeworkAverage(studentType *s, int n)
    {
    	double max, hmSum;
    	int indexMax;
    	for(int k=0; k<n; k++)
    	{
    		for (int i=0; i<4; i++)
    		{
    			max = s[k].homework[i];
    			indexMax = i;
    			for (int j=i+1; j<5; j++)
    			{
    				if (s[k].homework[j]>max)
    				{
    					max = s[k].homework[j];
    					indexMax = j;
    					double temp = s[k].homework[i];
    					s[k].homework[i] = s[k].homework[indexMax];
    					s[k].homework[indexMax] = temp;	
    				}
    			}
    		}
    	}
    	for (int i=0; i<n; i++)
    	{
    		hmSum = s[i].homework[0]+s[i].homework[1]+s[i].homework[2];
    		s[i].hmavg = ((hmSum/3)/10)* 100;
    	}
    }
    void averageAll (studentType *s, int n)
    {
    	for (int i=0; i<n; i++)
    	{
    		s[i].average = ((s[i].midterm/100*30) + (s[i].hmavg/100*30) + (s[i].final/100*40));
    	}
    }
    void displayData (studentType *s, int n)
    {
    	cout << "\nName\t\t\tMidterm  HMAvg  Final  Avg  Grade\n";
    	cout << "___________________________________________________________\n\n";
    	for (int i=0; i<n; i++)
    	{
    		cout << s[i].firstname << " ";
    		cout << s[i].lastname  << "\t\t";
    		cout << s[i].midterm << "\t";
    		cout << s[i].hmavg << "\t";
    		cout << s[i].final << "\t";
    		cout << s[i].average << "\t";
    		cout << s[i].grade;
    		cout << endl << endl;
    	}
    	cout << endl;
    }
    void grade(studentType *s, int n)
    {
    	char grade;
    	for (int i=0; i<n; i++)
    	{
    		if(s[i].average<=100 && s[i].average>=90)
    			grade = 'A';
    		else if(s[i].average<90 && s[i].average>=80)
    			grade = 'B';
    		else if(s[i].average<80 && s[i].average>=70)
    			grade = 'C';
    		else if(s[i].average<70)
    			grade = 'F';
    		s[i].grade = grade;
    	}
    }
    void arrangeAlphabetically(studentType *s, int n)
    {
    	string first;
    	int indexFirst;
    	for(int i=0; i<n-1; i++)
    	{
    		first = s[i].firstname;
    		for(int j=i+1; j<n; j++)
    		{
    			if(s[j].firstname[0]<first[0])
    			{
    				first = s[j].firstname;
    				indexFirst = j;
    				studentType temp = s[i];
    				s[i] = s[indexFirst];
    				s[indexFirst] = temp;
    			}
    		}
    	}
    }
    void arrangeByGrades(studentType *s, int n)
    {
    	studentType min;
    	int indexMin;
    	for(int i=0; i<n-1; i++)
    	{
    		min.grade = s[i].grade;
    		for(int j=i+1; j<n; j++)
    		{
    			if(s[j].grade<min.grade)
    			{
    				min.grade = s[j].grade;
    				indexMin = j;
    				studentType temp = s[i];
    				s[i] = s[indexMin];
    				s[indexMin] = temp;
    			}
    		}
    	}
    }

    The code works fine but I am having a problem with question 2 of the assignment where I have to sort the output, the problem I have is to sort data alphabetically if the grade is the same which is in the function called "arrangeByGrades" which is the last function ,, please help me complete the assignment with this small issue resolved
    Last edited by Salem; 09-29-2010 at 03:20 AM. Reason: delete font abuse

  2. #2
    and the hat of wrongness Salem's Avatar
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    So you add an
    if ( s[j].grade == min.grade )

    and then compare the names to decide whether to swap two elements of the array.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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