An imperative telling Pop-11 to run, or invoke, a procedure, is formed by writing the procedure name, followed by parentheses, with any arguments (if any are needed) between the parentheses. E.g.
square(5);I.e.: execute the procedure square with 5 as argument. i.e. the input variable, or formal parameter, used in the procedure definition, namely side, gets the value 5. Similarly, we can invoke doublesum with two arguments, both numbers:
doublesum(3,99) =>
** 204
I.e.: execute the procedure doublesum, with 3 and 99 as arguments. I.e
num1 gets the value 3 and num2 the value 99. The result (204) is printed
out by =>
Instead of printing out the result, we can assign it to a variable, e.g. x, thus:
doublesum(4, 60) -> x;Alternatively the result of doublesum can be used as input to another procedure, such as square, as in
square(doublesum(4, 60));Note that this is equivalent to:
4, 60, doublesum(), square();