Classnotes

eXercise #1

Introducing Pascal Syntax

1. Which of the following would NOT be acceptable as identifiers (if not, why not):
   
   
   1. last
   2. end
   3. 3rd_name
   4. the radius
   5. interger
   6. $1.00
   7. b/2a
   8. whyNot?
   9. <length>
   10. a_long____andPointlessName
   11. begin
   12. ten%


2. Given the following fictitious syntax definition:
   a thingo is defined as: letter digit [digit {digit|underscore}]
   1. Determine whether the following thingos are legal
      
      1. e4
      2. DD1_4_3
      3. U2222_222
      4. T66
   2. Write 3 different legal thingos by yourself



3. Referring to the following unit:
   

   Procedure TForm1.button1click(sender:TObject);
   
   {this is my first real program
   var x = real, y=interger;
   
   begin
   x = 2.5;
   y = square[x]
   showmessage('x = ' + strtoint(x));
   outputbox('y = ' + y)
   end
   

   Re-write it so that it is free of LOGICAL and SYNTAX ERRORS



4. Distinguish between a LOGICAL and a Syntax error - give an example of each to clearly show you know the difference



5. Explain, briefly, the difference between COMPILED languages and INTERPRETED languages.



6. Delphi/Pascal is said to be a THIRD GENERATION language - what are the other generations (with examples) and describe briefly how the generations differ.

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Solutions