MaplePrimes - answers and comments on Question, Programming Error Message

No semicolon for proc line

Carl Love — Mon, 25 Feb 2013 02:08:14 Z

The proc line should not end with a semicolon.

There is also a mistake in your type declaration, but the mistake will unfortunately not generate an error message. If you want a parameter to be restricted to having both type A and type B, then the type is And(A,B). So with that the proc line becomes

Grade:= proc(mark::And(nonnegative,numeric))

You should look up a user named Rupunzel on this forum. She got help about this very same homework problem in two separate threads a few days ago. There's a Users tab at the top of the page.

Shift-enter or Code Edit Region

Carl Love — Mon, 25 Feb 2013 23:11:37 Z

Yes, the "problem" is caused by the lack of end proc. You can avoid the problem two ways:

When you want a blank line, use Shift-Enter (or Shift-Return) instead of Enter (or Return). Don't hit Enter until you're ready for the procedure to be processed ("parsed" is the lingo). If you do hit Enter prematurely, just ignore any error message and put the cursor back where you want it. This takes a bit of getting used to, which brings us to my preferred method...
From the Insert Menu, create a Code Edit Region. This gives you a box, a subwindow, that you can use like Microsoft Notepad or other primitive text editor. Here, Enter just gives you a new line. When you want the code to be parsed (and Executed, if it's more than just a procedure definition), right-click in the box and select Execute Code. You can resize the box by left-clicking in it and then dragging one of the blue square dots on the sides or corners. But the box doesn't need to be big enough to hold your code; it will scroll if needed.

Put a semicolon after the end proc.

Same Error

TM0161 — Mon, 25 Feb 2013 14:15:12 Z

Thank you very much!

But.. I tried the proc line you suggested, and the same error still comes up.

I have not added an end proc line yet, maybe that is were I am going wrong? It still doesn't explain the error message