To allow subroutines to evolve over time without having to change all of the existing calls, Vera supports optional arguments. Optional arguments must have default values. To allow subroutines to evolve over time without having to change all of the existing calls, OpenVera supports optional arguments. Optional arguments must have default values.

subroutine (type optional_arg1 = default_value,type
optional_arg2 = default_value, ...) {
  statements
}

To allow subroutines to evolve over time without having to change all of the existing calls, OpenVera supports optional arguments. Optional arguments must have default values.

  1 program optional_value {
  2   print(1);
  3   print(1,2);
  4   print(1,2,3);
  5 }
  6 
  7 task print (integer m, ((integer n = 100)), (integer o = 10)) {
  8   printf("Inside m           %0d\n",m);
  9   printf("Inside n           %0d\n",n);
 10   printf("Inside o           %0d\n",o);
 11 }

 Inside m           1
 Inside n           100
 Inside o           10
 Inside m           1
 Inside n           100
 Inside o           2
 Inside m           1
 Inside n           2
 Inside o           3

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