if...then

The IF...THEN statement provides a way to change program flow based on a test expression.

1) IF test expression THEN expression(s)
2) IF test expression GOTO [branchlabel]
3) IF test expression THEN expression(s)1 ELSE expression(s)2
4) IF test expression GOTO [branchlabel1] ELSE [branchlabel2]
5) IF test expression THEN 
	expression(s)1
END IF
6) IF test expression THEN
	expression(s)1
  ELSE
	expression(s)2
END IF