In VERA, values can be passed to a task or function in following ways.

• Pass By Position
• Pass By Reference

Pass by value is the default method through which arguments are passed into functions and tasks. Each subroutine retains a local copy of the argument. If the arguments are changed within the subroutine declaration, the changes do not affect the caller.

  1 program pass_by_value {
  2   integer flow = 10;
  3   bit [7:0]  no = 100;
  4   print(no, flow);
  5   printf("After - Port Number %0d\n",no);
  6   printf("After - Flow Number %0d\n",flow);
  7 }
  8 
  9 task print (bit [7:0] port_no, integer flow_no) {
 10   printf("Inside Port Number %0d\n",port_no);
 11   printf("Insize  Number %0d\n",flow_no);
 12   flow_no ++;
 13   port_no ++;
 14   printf("New Flow Number %0d\n",flow_no);
 15   printf("New Port Number %0d\n",port_no);
 16 }

 Inside Port Number 100
 Insize  Number 10
 New Flow Number 11
 New Port Number 101
 After - Port Number 100
 After - Flow Number 10

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