Nested for loop saving last input not whole input

I'm back again with that C question heh. So I'm trying to get the user to input a whole 2d array (size, values, everything), with VLA arrays (im using the latest compiler). Everything is fine up until I get the nested for loop, then it saves the last value into the array and ignored anything before it. I cannot seem to figure out how to fix my VLA to iterate through every element in the array and assign the value typed in by the user, all I get is it saving my last value into the whole array. Through some testing I've found that my problem is contained in my Inner loop of my nested for loop. EDIT: Through the help of Weather Vane, it was figured out that the array needs to be initialized after my x and y are saved, but now it saves my last value in the whole array and not every value typed. Here's my code snippet:

   int x, y, row, col, a = 0;
   //int NxM[x][y]; Moved 
   bool counter[10]; //I have 1 last part to code that involves this

   printf("This program counts occurrences of digits 0 through 9 in an NxM 
   array.\n");

   printf("Enter the size of the array (Row Column): ");
   scanf("%d %d", &x, &y);
   int NxM[x][y]; //Moved here.
   for(row = 0; row < x; row++){
       printf("Enter row %d: \n", a);
       a++;
      for(col = 0; col < y; col++){


               scanf("%d ", &NxM[x][y]);//Why you only save 1 value >.<
        }


   }

(The reason I have my printf statement between my loops was to test where my looping problem was, and because I need my printf to look like Enter row 0 Enter row 1 etc..)