function_call ::= function _name [ ( actual_parameter_part ) ]
actual_parameter_part ::= parameter _association_list
With this function call exnor_out receives the return value of the function exnor .
x2 receives the return value of the function exnor . Here, the transfer parameters a and b have the values of the stated vector ranges.
i receives the sum of the return values of the two functions bit_to_integer and count_ones .