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begin case
(tab)case boolean_expression
(tab)(tab)statement(s)
(tab)case boolean_expression
(tab)(tab)statement(s)
(tab)else
(tab)(tab)statement(s)
end case

The case structure allows the programmer to create a structure to test multiple conditions. Only the first true condition is executed and all of the other conditions are skipped. If there is an optional else as the last condition this will be executed if no other conditions are met.

for t = 1 to 10
   begin case
      case t < 3
         print t + " is less than 3"
      case t < 7
         print t + " is less than 7 but 3 or larger"
      else
         print t +  " is 7 or larger"
   end case
next t

displays:

1 is less than 3
2 is less than 3
3 is less than 7 but 3 or larger
4 is less than 7 but 3 or larger
5 is less than 7 but 3 or larger
6 is less than 7 but 3 or larger
7 is 7 or larger
8 is 7 or larger
9 is 7 or larger
10 is 7 or larger