// Faan Tone Liu
// Comp 1672
// 1/15/2003
// Demo program for comp 1672
// This program shows various aspects of two-dimensional arrays

#include <iostream>
using namespace std;
const int num_rows(3);  // This is the number of rows in my array, and it
                        // corresponds to the number of students
const int num_cols(4);  // This is the number of columns in my array, and it
                        // corresponds to the number of exams given

void print_array(int arr[][num_cols]);

int main()
{
    int i, j;
    // Declare and initialize array that holds the exam scores for all students
    int testscores[num_rows][num_cols] =
         { {95, 97, 93, 96},    // Scores for first student
           {86, 0, 82, 88},     // Scores for second student
           {69, 78, 85, 91} };  // Scores for third student 

    // example of how to access array; output the entire last row
    // which corresponds to all the scores for one student
    cout << "Here are the scores for the last student: ";
    for (i = 0; i < num_cols; i++)
        cout << testscores[2][i] << " ";
    cout << endl;

    // Now let's output the entire 3rd column, which corresponds to the
    // scores on the third exam
    cout << "Here are the scores for the 3rd exam: " << endl;
    for (i = 0; i < num_rows; i++)
        cout << testscores[i][2] << endl;

    // Here's an example of how to pass an array to a function:
    cout << "Here are all of the scores:" << endl;
    print_array(testscores);

    // Here's how we would set all values of the array to 0.
    // This example shows how to traverse the entire array.
    for (i=0; i < num_rows; i++) {
        for (j=0; j < num_cols; j++) {
            testscores[i][j] = 0;
        }
    }

    // Here's an example of how to pass an array to a function:
    cout << "Here are all of the scores:" << endl;
    print_array(testscores);

    return 0;
}

// This function outputs the values in the array, assumes the array is
// num_rows by num_cols
void print_array(int arr[][num_cols])
{
    int i, j;
    for (i=0; i < num_rows; i++) {
        for (j=0; j < num_cols; j++)
            cout << arr[i][j] << " ";
        cout << endl;
    }
        
}