check the number of unique number

 
// Code your testbench here
// or browse Examples
​
​
class A;
  rand int num[10];
​
  rand int helper[10];
  
  constraint num_c{
    foreach(num[i]){
      num[i] inside {[0:9]};
    }
  }
      
  task print_t();
    int i = 2;
    fork
      while(i) begin
        #5;
        $display("time stamp %t, i=%0d", $time, i);
        i--;
      end
    join_none
  endtask
​
endclass
            
            
module top;
  initial begin
    A a = new();
    a.print_t();
    $display("outside of the loop, timestamp = %t", $time);
    repeat(10) begin
      a.randomize();
      $display("randomized number: %0p", a.num);
      check_un(a.num);
    end
  end
  
endmodule
​
// check the number of unqiue number in a array
​
function int check_un(int arr[]);
  int hash_arr[int];
  int unique_arr[$];
  int result;
  for(int i=0;i<arr.size();i++) begin
    if(hash_arr.exists(arr[i])) hash_arr[arr[i]]++;
    else hash_arr[arr[i]] = 1;
  end
​
  
  unique_arr = hash_arr.find_index() with (item == 1);
  if(unique_arr.size() != 0)
    result = unique_arr.size();
  else 
    result = -1;
  $display("hash arr is %p", hash_arr);
  return result;
​
endfunction
    
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