Thread: How to create a multi-dimensional user array?

The only line that I see is wrong:

Code:

cout << setw (4) << grades [i][j];

For one, j will be 4 each time this line gets called, which is out of bounds.

Edit: Never mind the second part of my post

how hard is it really?
code for input:

Code:

for (int i = 0; i <numrow; i++)
{
    for (int j = 0; j < numcol; j++)
    {
        // prompt for input and store in the proper place
    }
}

and code for output:

Code:

for (int i = 0; i <numrow; i++)
{
    for (int j = 0; j < numcol; j++)
    {
        // output elements
    }
    // print newline here
}

and what was wrong with indigo0086's response when you posted this question a couple days ago?

> I have been working on this for days and I still can't figure it out.
Perhaps if you indented your code properly, you'd see the position of your cout's make no sense.

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 <numrow; i++)
  {
    for (int j = 0; j < numcol; j++)
    {
      // a cout for every value, not every row
      cout << "enter grades for row # " << (i + 1)<< ": ";
      cin >> grades [i][j];
    }
    // a cout after the j loop has finished
    // j is actually out of scope here
    // g++ reports
    // foo.cpp:21: error: name lookup of `j' changed for new ISO `for' scoping
    // foo.cpp:13: error:   using obsolete binding at `j'
    cout << setw (4) << grades [i][j];
  }

  return 0;
}