Storing and printing matrices

I am trying to make a program which will ask the user to input a series of numbers, then in end, display the numbers. I am using arrays and need to save the numbers in a 3x4 matrix and then display it. This is what I have:

Code:

---

#include <iostream>
#include <iomanip>
using namespace std;

const int numrow = 3;
const int numcol = 4;
       
int grades [numrow][numcol];

int main ()
{
        for (int i = 0; i <= 3; i++)
        {
        cout << endl;
        for (int j = 0; j <= 4; j++)
        {
        cout << "enter grades for row # " << (i + 1)<< ": ";
        cin >> grades [numrow][numcol];
        }
        }
            cout << setw (4) << grades [i][j];

        return 0;
}

---

any help would be greatly appreciated as I do not know what is missing/ needs to be put in/ needs to be changed/ etc.

1) you should have the for loop control variables set to numrow and num col (i < numrow) (j < numcol) - (not i <= numrow since the last indice will always be one less than the size) - so you don't have to go back and change them when you change the size of the array

2)

Code:

---

cin >> grades [numrow][numcol];

---

You're resetting the same variable which is grades[3][4]. Which is out of the array boundaries. Remember the array of size three has elements [0][1][2].

3) Your'e outputting the Grades[i][j] outisde of the scope of where i and j were declared. You'd have to do another loop to output it.

Here's what I got.

Code:

---

#include <cstdlib>
#include <iostream>

using namespace std;

int main()
{
    const int numrow = 3;
    const int numcol = 4;
       
    int grades [numrow][numcol];

        for (int i = 0; i < numrow; i++)
        { 
          cout << endl;
          for (int j = 0; j < numcol; j++)
          {
              cout << "enter grades for row # " << (i + 1) << ": ";
              cin >> grades [i][j];
          }
        }       
   
    for (int i = 0; i < numrow; i++)
        {     
          cout << endl;
          for (int j = 0; j < numcol; j++)
          {
              cout << setw(4) << grades[i][j];
          }
        }
        cout << endl;

    system("PAUSE");
    return 0;
}

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