Question

I am trying to put either an X or an O in an array. It doesn’t seem to work, however. It says, “Run-Time Check Failure #2 – Stack around the variable ‘row1’ was corrupted.”

char row1[19];
char row2[19];
char row3[19];
char row4[19];

for (int i = 0; i < 20; i++)
{
    int r = int(((double) rand() / (RAND_MAX)) + 1);

    if (r == 0)
    {
        row1[i] = 'X';
    }
    else
    {
        row1[i] = 'O';
    }

}

cout << row1[0] << endl;

How can I generate a random X or O? Thank you.

Answer 1

As elmigranto stated: your loop is incorrect. It should be:

for (int i = 0; i < 19; i++)

That is because char row4[19]; is an array that contains 19 elements. The first element is row4[0] and the last is row4[18] because the numbering is starts from 0. So in the last loop row[19] will cause an error.