13 Execute <body> if <expression> is true. If <expression> is not true then
14 run the optional ELSE body. Multiple IF's can be written with ELIF. The
15 IF construction should end with ENDIF or END IF or FI. Example:
19 PRINT "This is strange:"
20 PRINT "a is bigger than 10"
22 PRINT "a is smaller than 10"
25 If only one function or statement has to be executed, then the
26 if-statement also can be used without a body. For example:
28 IF age > 18 THEN PRINT "You are an adult"
29 ELSE INPUT "Your age: ", age
31 Use with care as nested IF/THEN statements using one function may