Final program for CIS67 - Fall 96

1.  Declare  a record student as described below:

	data stored:
	name - a string
	scores - an array of 3 test scores
	average - average of 3 scores
	grade - letter grade

	functions for a student record:
       
	read with file argument (type stream) and type student argument - 
reads one student's name and 3 scores from an input stream (could be cin)

	void read_student (istream& ins, student& stu)
	{
		getline(ins, stu.name, '\n');
		ins >> stu.scores[0] >> stu.scores[1] >> stu.scores[2];
		ins.ignore (100, '\n');    // skip end of line mark
	}

	The function call  
		cout << "Type in the student data: " << endl;
		cout << "Type in a name of first line and then 3 scores:";
		read_student(cin, one_stu);

 	prompts for and reads the data into student one_stu from cin (the keyboard). The function call
	
		read_student(infile, my_best_stu);

	reads the data from stream infile into my_best_stu (no prompt required).

	These functions need to have a student& argument. They change one 
field of the student argument.
	
	comp_ave(student&) - computes average score of 3 scores that have 
been stored for a student. Finds the average of the 3 scores that have been stored.

As an example, the follwing function defines the average incorrectly based on just the first exam score:

void comp_ave(student& a_stu)
{
	stu.average = stu.scores[0];   // incorrect comp_ave function.
}

	set_grade(student&) - sets a student's grade using a standard scale (A is 90-100,
			B is 80 - 89, etc.) based on the average which has been computed and stored.
	change_score (student&, int) - changes an exam score for a student. 
                        The function user will indicate
			which of the three scores (0, 1, or 2) should be changed. 
	write_stu(ostream&, student&) - 
             		writes a student's data to an output stream (could be cout). See discussion of read_student.

2.  Write a program that uses an array to store all data about a section of 
students. Write functions that use the functions above to do the 
following operations.

1.  Read all student data from a stream into an array of students. For simplicity, 
    assume the number of student is the first data item in the stream.
	2.  Read and append a new student record to the end of the array 
	3.  Compute average grades for all students
	4.  Assign letter grades to all students
	5.  Change a score for a specified student and recompute average and 
		grade (user enters student number and score number).
	6.  Display a specified student record (user enters the student
                number)
              6.1 Display a specified student record (user enters the student 
                name)
	7.  Display all student records on the screen
	8.  Write the student records to a file
        9.  Sort the records in the array in decreasing order by score.
       10.  Sort the records in the array in alphabetical order by name.

You should do this in stages. 

End of week 1 (April 16):  Steps 1, 7, 8
End of week 2:  (April 23)  Steps 2, 3, 4,
End of week 3:  (April 30)  Steps 5, 6, 6.1, 9, 10

Write a menu-driven program that tests all these functions.

Those who want to earn an A in the course can do more than this. For extra 
credit, set up a separate header file to hold the definition of the student struct and the function prototypes. 

More extra credit. Define a class student with private data members and member
functions that perform all the operations listed for a student record. Write a 
client program that uses these member functions to do tasks 1 -10. (See chapter 11 or 
me for ideas about this.)