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The error message is correct. You did not define the size of the array. You have 3 choices:

1. Declare it with a constant length

   int foo[10];

2. Declare it and initalize it

   int foo[] = {0,1,2,3,4,5,6,7,8,9};

3. Declare it dynamic as pointer and alloc or realloc the mem by yourself (this is not recommended (realloc) because of possible heap memory fragmentation)

   int foo; int size = 10; foo = (int)malloc(size * sizeof(int)); free(foo);

As reference: http://www.arduino.cc/en/pmwiki.php?n=Reference/Array