To handle common cases or allow for unused arguments, Vera allows you to define default values for each scalar argument.

When the subroutine is called, you can omit an argument that has a default defined for it. Use an asterisk (*) as a placeholder in the subroutine call. If an asterisk is used for a variable that does not have a default value, a compilation error occurs.

  1 program default_value {
  2   bit [7:0]  no = 100;
  3   print(*,no,*);
  4   print(21,no,10);
  5 }
  6 
  7 task print (integer m = 0, var bit [7:0] port_no, 
  8   integer flow_no = 0) {
  9   
 10   printf("Inside m           %0d\n",m);
 11   printf("Inside Port Number %0d\n",port_no);
 12   printf("Inside Flow Number %0d\n",flow_no);
 13 }

 Inside m           0
 Inside Port Number 100
 Inside Flow Number 0
 Inside m           21
 Inside Port Number 100
 Inside Flow Number 10

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