Basic Pascal Tutorial/Chapter 3/CASE

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Revision as of 17:34, 10 November 2007 by Kees (talk | contribs) (New page: 3Cb - CASE Suppose you wanted to branch one way if <tt>b</tt> is <tt>1, 7, 2037,</tt> or <tt>5</tt>; and another way if otherwise. You could do it by: <font color="#006699"><strong>if</s...)
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3Cb - CASE

Suppose you wanted to branch one way if b is 1, 7, 2037, or 5; and another way if otherwise. You could do it by:

if (b = 1) or (b = 7) or (b = 2037) or (b = 5) then
  Statement1
else
  Statement2;

But in this case, it would be simpler to list the numbers for which you want Statement1 to execute. You would do this with a case statement:

case b of
  1,7,2037,5: Statement1;
  otherwise   Statement2
end;

The general form of the case statement is:

case selector of
   List1:    Statement1;
   List2:    Statement2;
   ...
   Listn:    Statementn;
   otherwise Statement
end;

The otherwise part is optional. When available, it differs from compiler to compiler. In many compilers, you use the word else instead of otherwise.

selector is any variable of an ordinal data type. You may not use reals!

Note that the lists must consist of literal values. That is, you must use constants or hard-coded values -- you cannot use variables.

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