Printing character pattern using arrays

This is the question from spoj . The question is to print a chess board like pattern with asterisk(*) and dot(.) starting with * The link for the question is given below:

spoj.com/problems/CPTTRN1

And here is my code.

#include<stdio.h>

int main()
{
    int t;
    scanf("%d",&t);
    while(t--)
     {
       int l,c,i,j;
       scanf("%d %d",&l,&c);
       int arr[l][c];
       for(i=0;i<l;i+=2)
         {
            for(j=0;j<c;j+=2)
             {
                arr[i][j]='*';
             }
         }
      for(i=1;i<l;i+=2)
       {
         for(j=1;j<c;j+=2)
         {
           arr[i][j]='.';
         }
      }
      for(i=0;i<l;i++)
       {
         for(j=0;j<c;j++)
           {
              printf("%c",arr[i][j]);
           }
         printf("\n");
      }
    }
    return 0;
}

But I am not getting the answer. Also I am getting other characters other than dot and asterisk.

What is wrong in my code?

Also can't we use 2d arrays for printing patterns?