Syntax
IF expression THEN statement(s) [ELSE
statement(s) ]
IF
expression [THEN]
statement(s)
[ELSEIF
expression [THEN]
statement(s)
]
[ELSE
statement(s) ]
ENDIF
Description
IF...THEN is a way to make decisions. It is a mechanism to execute code
only if a condition is true, and can provide alternative code to execute based
on more conditions.
The syntax allows single line IF..THEN, or multi-line versions that end with
ENDIF.
The single line version only allows simple statements. To use nested
IFs the multi-line version must be used.
Version 7.00 allows ENDIF or END IF
Example
'e.g. here is a simple "guess the number" game
using if...then for a
decision.
PRINT "guess the number between 0 and
10"
DO 'Start a
loop
PRINT
"guess"
DEBUGIN
y
'Input a number from the
user
IF x = y THEN
PRINT "right!" 'He/she guessed the right
number!
EXIT
ELSEIF y > 10 THEN 'The number is higher then
10
PRINT "The number cant be greater then 10! Use
the force!"
ELSEIF
x > y THEN
PRINT "too
low" 'The users guess is to low
ELSEIF x < y THEN
PRINT "too high" 'The users guess is to
high
ENDIF
LOOP 'Go back
to the start of the loop
Differences from other BASICS
See also
