Description
The ELSE instruction always comes after an IF...THEN instruction. The ELSIF instruction determines that
an instruction or group of instructions is only executed if the associated
Boolean expression for the IF instruction has the
value 0 (false) and the associated Boolean expression of the ELSIF instruction has the value 1 (true). If the condition
of the IF instruction is 1 (true) or the condition
of the ELSIF instruction is 0 (false), the command
or group of commands will not be executed.
The THEN instruction identifies the end of the ELSIF condition(s)
and the beginning of the instruction(s).
NOTE: Any
number of
IF...THEN...ELSIF...THEN...END_IF instructions
may be nested to generate complex selection instructions.Example ELSIF...THEN
IF A>B THEN
C:=SIN(A) * COS(B) ;
B:=SUB(C,A) ;
ELSIF A=B THEN
C:=ADD(A,B) ;
B:=MUL(C,A) ;
END_IF ;For Example Nested Instructions
IF A>B THEN
IF B=C THEN
C:=SIN(A) * COS(B) ;
ELSE
B:=SUB(C,A) ;
END_IF ;
ELSIF A=B THEN
C:=ADD(A,B) ;
B:=MUL(C,A) ;
ELSE
C:=DIV(A,B) ;
END_IF ;