Generate unique elements in an array

UVM
45

In reply to deepthig:

I didn’t get the expected output after using the above approach.What is wrong in my code

class a;
  
  rand bit [3:0]a[15];
  
        
        constraint uniq_c {
          foreach(a[i]) {   	
            foreach(a[j]) {
       		if(j != i){
              a[j] !=a[i];
		    }
       }
    }
 }
        
        
   
  
function void post_randomize();
a.shuffle();
    endfunction
endclass

 
module test;
  a a_i;
  int temp,i=0;
  initial begin
  a_i = new();
 
    foreach(a_i.a[i])begin
        a_i.randomize();
        temp=a_i.a[i];
      $display("array value[%d] =%d",i,temp);
      
    end  
     
      
#100;
  end
endmodule

output:

array value[ 0] = 3
array value[ 1] = 5
array value[ 2] = 3
array value[ 3] = 6
array value[ 4] = 5
array value[ 5] = 4
array value[ 6] = 10
array value[ 7] = 8
array value[ 8] = 4
array value[ 9] = 14
array value[ 10] = 1
array value[ 11] = 7
array value[ 12] = 11
array value[ 13] = 15
array value[ 14] = 13