//Reads quiz scores for each student into the two-dimensional array grade 
//(but the input code is not shown in this display). 
//Computes the average score for each student and
//the average score for each quiz. Displays the quiz scores and the averages.
#include <iostream.h>
#include <iomanip.h>
const int NUMBER_STUDENTS = 4, NUMBER_QUIZZES = 3;

void compute_st_ave(const int grade[][NUMBER_QUIZZES], double st_ave[]);
//Precondition: Global constant NUMBER_STUDENTS and NUMBER_QUIZZES
//are the dimensions of the array grade. Each of the indexed variables
//grade[st_num-1, quiz_num-1] contains the score for student st_num 
//on quiz quiz_num.
//Postcondition: Each st_ave[st_num-1] contains the average for student 
//number stu_num.

void compute_quiz_ave(const int grade[][NUMBER_QUIZZES], double quiz_ave[]);
//Precondition: Global constant NUMBER_STUDENTS and NUMBER_QUIZZES
//are the dimensions of the array grade. Each of the indexed variables
//grade[st_num-1, quiz_num-1] contains the score for student st_num 
//on quiz quiz_num.
//Postcondition: Each quiz_ave[quiz_num-1] contains the average for 
//quiz numbered quiz_num.

void display(const int grade[][NUMBER_QUIZZES],
                            const double st_ave[], const double quiz_ave[]);
//Precondition: Global constant NUMBER_STUDENTS and NUMBER_QUIZZES are the
//dimensions of the array grade. Each of the indexed variables 
//grade[st_num-1, quiz_num-1] contains the score for student st_num on 
//quiz quiz_num. Each st_ave[st_num-1] contains the average for student 
//stu_num. Each quiz_ave[quiz_num-1] contains the average for quiz 
//numbered quiz_num.
//Postcondition: All the data in grade, st_ave, and quiz_ave have been output.

int main( )
{
    int grade[NUMBER_STUDENTS][NUMBER_QUIZZES];
    double st_ave[NUMBER_STUDENTS];
    double quiz_ave[NUMBER_QUIZZES];


    cout << "I am filling the array grade for you.\n";
    grade[0][0] = 10; grade[0][1] = 10; grade[0][2] = 10;
    grade[1][0] = 2; grade[1][1] = 0; grade[1][2] = 1;
    grade[2][0] = 8; grade[2][1] = 6; grade[2][2] = 9;
    grade[3][0] = 8; grade[3][1] = 4; grade[3][2] = 10;

    compute_st_ave(grade, st_ave);
    compute_quiz_ave(grade, quiz_ave);
    display(grade, st_ave, quiz_ave);
    return 0;
}

void compute_st_ave(const int grade[][NUMBER_QUIZZES], double st_ave[])
{
    for (int st_num = 1; st_num <= NUMBER_STUDENTS; st_num++)
    {//Process one st_num:
        double sum = 0;
        for (int quiz_num = 1; quiz_num <= NUMBER_QUIZZES; quiz_num++)
            sum = sum + grade[st_num-1][quiz_num-1];
        //sum contains the sum of the quiz scores for student number st_num.
        st_ave[st_num-1] = sum/NUMBER_QUIZZES;
        //Average for student st_num is the value of st_ave[st_num-1]
    }
} 

void compute_quiz_ave(const int grade[][NUMBER_QUIZZES],double quiz_ave[])
{
    for (int quiz_num = 1; quiz_num <= NUMBER_QUIZZES; quiz_num++)
    {//Process one quiz (for all students):
        double sum = 0;
        for (int st_num = 1; st_num <= NUMBER_STUDENTS; st_num++)
            sum = sum + grade[st_num-1][quiz_num-1];
        //sum contains the sum of all student scores on quiz number quiz_num.
        quiz_ave[quiz_num-1] = sum/NUMBER_STUDENTS;
        //Average for quiz quiz_num is the value of quiz_ave[quiz_num-1]
    }
}

//Uses iostream.h and iomanip.h:
void display(const int grade[][NUMBER_QUIZZES],
                         const double st_ave[], const double quiz_ave[])
{
    cout.setf(ios::fixed);
    cout.setf(ios::showpoint);
    cout.precision(1);

    cout << setw(10) << "Student"
         << setw(5) << "Ave"
         << setw(15) << "Quizzes\n";
    for (int st_num = 1; st_num <= NUMBER_STUDENTS; st_num++)
    {//Display for one st_num:
        cout << setw(10) << st_num 
             << setw(5) << st_ave[st_num-1] << " ";
        for (int quiz_num = 1; quiz_num <= NUMBER_QUIZZES; quiz_num++)
            cout << setw(5) << grade[st_num-1][quiz_num-1];
        cout << endl;
    }

    cout << "Quiz averages = ";
    for (int quiz_num = 1; quiz_num <= NUMBER_QUIZZES; quiz_num++)
        cout << setw(5) << quiz_ave[quiz_num-1];
    cout << endl;
}