Print the array in spiral form

#include <iostream>

using namespace std;

int main() 
{
    int arr[3][6] = { { 1, 2, 3, 4, 5, 6 }, 
                    { 7, 8, 9, 10, 11, 12 }, 
                    { 13, 14, 15, 16, 17, 18 } }; 
    int i,t=0,b=2,l=0,r=5,dir=0; // t,b,l,r are pointers pointing to top, bottom, left and right of the 2D array
    while(l<=r && t<=b)                 
    {
        if(dir==0)          //printing from left to right 
        {
            for(i=l;i<=r;i++)
                cout<<arr[t][i]<<" ";
            t++;
        }
        else if(dir==1)       //printing from top to bottom 
        {
            for(i=t;i<=b;i++)
                cout<<arr[i][r]<<" ";
            r--;
        }
        else if(dir==2)     //printing from right to left  
        {
            for(i=r;i>=l;i--)
                cout<<arr[b][i]<<" ";
            b--;
        }
        else if(dir==3)     //printing from bottom to top
        {
            for(i=b;i>=t;i--)
                cout<<arr[i][l]<<" ";
           l++;
        }
        dir = (dir+1)%4;                //changing the direction each time
    }
}