C++ กระดานมหาสนุก

int i, j, temp, num;
char dir;
char x[4][4] = { { 'a','b','c','d' },
{ 'e','f','g','h' },
{ 'i','j','k','l' },
{ 'm','n','o','p' } };
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
cout << x[i][j] << "\t";
}
cout << endl;
}
while (1)
{
cout << endl << "Input number {0-3} and char {l,r,u,d} : ";
cin >> num >> dir;
if (num == -1)
{
break;
}
if (dir == 'l')
{
temp = x[num][0];
for (i = 0; i < 3; i++)
{
x[num][i] = x[num][i + 1];
}
x[num][3] = temp;
}
else if (dir == 'r')
{
temp = x[num][3];
for (i = 3; i>0; i--)
{
x[num][i] = x[num][i - 1];
}
x[num][0] = temp;
}
else if (dir == 'd')
{
temp = x[3][num];
for (i = 3; i>0; i--)
{
x[i][num] = x[i - 1][num];
}
x[0][num] = temp;
}
else if (dir == 'u')
{
temp = x[0][num];
for (i = 0; i<3; i++)
{
x[i][num] = x[i + 1][num];
}
x[3][num] = temp;
}
cout << endl << endl;
for (i = 0; i < 4; i++)
{
for (j = 0; j < 4; j++)
{
cout << x[i][j] << "\t";
}
cout << endl;
}
}