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  • Block IF:
    • A block IF starts with an IF <test> THEN line and ends with an ENDIF line. 
      if value LT 0 then
  say "the value is negative"
endif
    • The block IF can also have an ELSE clause that is executed when the test is false. 
      if value LT 0 then
  say "the value is negative"
else
  say "the value is not negative"
endif
    • The block IF can have one or more ELSEIF blocks that test for other other conditions when the previous one(s) have not been satisfied. 
      if value LT 0 then
  say "the value is negative"
elseif value EQ 0 then
  say "the value is zero"
else
  say "the value is positive"
endif
    • The use of THEN is technically optional, but is strongly recommended.
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